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x in (-oo:+oo)
-27 = 7*x+2*x+9 // - 7*x+2*x+9
-(7*x)-(2*x)-27-9 = 0
-7*x-2*x-27-9 = 0
-9*x-36 = 0 // + 36
-9*x = 36 // : -9
x = 36/(-9)
x = -4
x = -4
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