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x in (-oo:+oo)
(9/8)*(x+7) = -2 // + 2
(9/8)*(x+7)+2 = 0
9/8*(x+7)+2 = 0
9/8*(x+7)+2 = 0
9/8*x+79/8 = 0
9/8*x+79/8 = 0
9/8*x+79/8 = 0 // - 79/8
9/8*x = -79/8 // : 9/8
x = -79/8/9/8
x = -79/9
x = -79/9
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