If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
x = (4/2)*y // - (4/2)*y
x-((4/2)*y) = 0
x-2*y = 0
x-2*y = 0 // + -2*y
x = -(-2*y)
x = 2*y
x = 2*y
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