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 = 30 // - 30
y/2-30 = 0
1/2*y-30 = 0 // + 30
1/2*y = 30 // : 1/2
y = 30/1/2
y = 60
y = 60
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