If it's not what You are looking for type in the equation solver your own equation and let us solve it.
u in (-oo:+oo)
(7/6)*u = 42 // - 42
(7/6)*u-42 = 0
7/6*u-42 = 0 // + 42
7/6*u = 42 // : 7/6
u = 42/7/6
u = 36
u = 36
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