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x in (-oo:+oo)
-43 = 4*x+2*x+5 // - 4*x+2*x+5
-(4*x)-(2*x)-43-5 = 0
-4*x-2*x-43-5 = 0
-6*x-48 = 0 // + 48
-6*x = 48 // : -6
x = 48/(-6)
x = -8
x = -8
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