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x in (-oo:+oo)
-(4*x)-3 = -43 // + 43
43-(4*x)-3 = 0
43-4*x-3 = 0
40-4*x = 0 // - 40
-4*x = -40 // : -4
x = -40/(-4)
x = 10
x = 10
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