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x in (-oo:+oo)
-(7*x)-(7*x)-9 = 47 // - 47
-(7*x)-(7*x)-47-9 = 0
-7*x-7*x-47-9 = 0
-14*x-56 = 0 // + 56
-14*x = 56 // : -14
x = 56/(-14)
x = -4
x = -4
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