Hello there, I just solve the problem as David Joyner explained. Here
is the code:
sage: var('w1,x2,x,y')
(w1, x2, x, y)
sage: U=x+2*y
sage: V=(3*x)+(4*y)
sage: W=(w1*x)+(4*y)
sage: Z=((-2)*x)+(x2*y)
sage: solve(2*u==w,w1)
[w1 == 2]
It´s not all done but is just a matter of putting solve and the
problem to solve.
Thanks David :-)
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