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x in (-oo:+oo)
-27/10 = 3*x // - 3*x
-(3*x)-27/10 = 0
-3*x-27/10 = 0
-3*x-27/10 = 0 // + 27/10
-3*x = 27/10 // : -3
x = 27/10/(-3)
x = -9/10
x = -9/10
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