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x in (-oo:+oo)
(7*x+61)/8 = 5 // - 5
(7*x+61)/8-5 = 0
(7*x+61)/8+(-5*8)/8 = 0
7*x-5*8+61 = 0
7*x+21 = 0
(7*x+21)/8 = 0
(7*x+21)/8 = 0 // * 8
7*x+21 = 0
7*x+21 = 0 // - 21
7*x = -21 // : 7
x = -21/7
x = -3
x = -3
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