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)
(2/7)*u = 28 // - 28
(2/7)*u-28 = 0
2/7*u-28 = 0 // + 28
2/7*u = 28 // : 2/7
u = 28/2/7
u = 98
u = 98
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