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)
(1/4)*y = 20 // - 20
(1/4)*y-20 = 0
1/4*y-20 = 0 // + 20
1/4*y = 20 // : 1/4
y = 20/1/4
y = 80
y = 80
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