If it's not what You are looking for type in the equation solver your own equation and let us solve it.
y in (-oo:+oo)
y/2-4 = 4 // - 4
y/2-4-4 = 0
1/2*y-8 = 0 // + 8
1/2*y = 8 // : 1/2
y = 8/1/2
y = 16
y = 16
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