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)
u-(40/7) = 7 // - 7
u-(40/7)-7 = 0
u-40/7-7 = 0
u-89/7 = 0 // + 89/7
u = 89/7
u = 89/7
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