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x in (-oo:+oo)
-(7*x)-(4*x)-3 = 63 // - 63
-(7*x)-(4*x)-63-3 = 0
-7*x-4*x-63-3 = 0
-11*x-66 = 0 // + 66
-11*x = 66 // : -11
x = 66/(-11)
x = -6
x = -6
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