Why ('t=(2x+1)/(2x-2)','x') is unsolvable?

The code was:

solve('t=(2x+1)/(2x-2)','x')

t is an uncertain constant

The error message is:

Warning: Support of character vectors that are not valid variable names or define a number will be removed

in a future release. To create symbolic expressions, first create symbolic variables and then use

operations on them.

> In sym> convertExpression (line 1586)

In sym> convertChar (line 1491)

In sym> tomupad (line 1243)

In sym (line 199)

In solve> getEqns (line 406)

In solve (line 226)

Incorrect use of symengine

Unexpected 'identifier'.

Error sym> convertExpression (line 1593)

s = mupadmex ((x));

Error sym> convertChar (line 1491)

s = convertExpression (x);

Error sym> tomupad (line 1243)

S = convertChar (x);

Error sym (line 199)

S.s = tomupad (x);

Error solve> getEqns (line 406)

a = sym (a);

Error solve (line 226)

[eqns, vars, options] = getEqns (varargin {:});

The solution I want to get is a formula containing 't' and use 't' to calculate 'x'

I also tried to solve another equation

solvesolve ('v-u-3 * t ^ 2 = 0', 'v')

The result was

ans =

3 * t ^ 2 + u

I want to get this formula that uses parameters to represent unknowns, rather than x for a particular t.

Answer 1

[Star Strider]

Correct syntax:

syms t x
solve(t==(2*x+1)/(2*x-2),x)

producing:

ans =
(2*t + 1)/(2*t - 2)

[Walter Roberson]

The above is the better way. However in your release you can also

solve('t=(2*x+1)/(2*x-2)','x')

This is not possible in newer versions of MATLAB, only in older versions.