If it's not what You are looking for type in the equation solver your own equation and let us solve it.
u in (-oo:+oo)
(1/2)*u = 12 // - 12
(1/2)*u-12 = 0
1/2*u-12 = 0 // + 12
1/2*u = 12 // : 1/2
u = 12/1/2
u = 24
u = 24
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