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x in (-oo:+oo)
-75 = 5*x+2*x+2 // - 5*x+2*x+2
-(5*x)-(2*x)-75-2 = 0
-5*x-2*x-75-2 = 0
-7*x-77 = 0 // + 77
-7*x = 77 // : -7
x = 77/(-7)
x = -11
x = -11
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