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x in (-oo:+oo)
(1/5)*x-1 = 7/8 // - 7/8
(1/5)*x-(7/8)-1 = 0
(1/5)*x-7/8-1 = 0
1/5*x-15/8 = 0 // + 15/8
1/5*x = 15/8 // : 1/5
x = 15/8/1/5
x = 75/8
x = 75/8
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