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)
(1/2)*x = 50 // - 50
(1/2)*x-50 = 0
1/2*x-50 = 0 // + 50
1/2*x = 50 // : 1/2
x = 50/1/2
x = 100
x = 100
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