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x in (-oo:+oo)
(1*x)/8 = 7 // - 7
(1*x)/8-7 = 0
x/8-7 = 0
1/8*x-7 = 0 // + 7
1/8*x = 7 // : 1/8
x = 7/1/8
x = 56
x = 56
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