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x in (-oo:+oo)
-48 = 4*x+6*x+2 // - 4*x+6*x+2
-(4*x)-(6*x)-48-2 = 0
-4*x-6*x-48-2 = 0
-10*x-50 = 0 // + 50
-10*x = 50 // : -10
x = 50/(-10)
x = -5
x = -5
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