use the "subs" command to subsitute equations for a variable

Here is a silly question: is there a way to use the "subs" command to subsitute equations for a variable?

eqn = 2*(2*x-1) + 3*(3*x+2) + 4*(4*x-5)=11
eqn1 = subs(eqn, {2*x-1,3*x+2,4*x-5}, {a,b,c}); ???

The result:

2*a+3*b+4*c=11 ???

[Azzi Abdelmalek]

What is the aim of doing this?

[Philosophaie]

Simplify the viewing of large equation.

[Walter Roberson]

It makes a difference as to whether the expressions appear exactly, or if instead you want an algebraic transformation. For example if the code had 2*x-2 and you substituted 2*x-1 -> a, then would you want the result to be a-1 or would you want the substitution to be skipped ?

Answer 1

[Azzi Abdelmalek]

syms x a
y=2*(2*x-1);
subs(y,a)