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 = u+5/8 // - u+5/8
7-u-(5/8) = 0
7-u-5/8 = 0
51/8-u = 0 // - 51/8
-u = -51/8 // * -1
u = 51/8
u = 51/8
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