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/8 = 12.5 // - 12.5
y/8-12.5 = 0
1/8*y-12.5 = 0 // + 12.5
1/8*y = 12.5 // : 1/8
y = 12.5/1/8
y = 100
y = 100
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