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x in (-oo:+oo)
-(7*x)-6 = 50 // - 50
-(7*x)-50-6 = 0
-7*x-50-6 = 0
-7*x-56 = 0 // + 56
-7*x = 56 // : -7
x = 56/(-7)
x = -8
x = -8
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