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3*(-(7*x)-6) = 108 // - 108
3*(-(7*x)-6)-108 = 0
3*(-7*x-6)-108 = 0
3*(-7*x-6)-108 = 0
-21*x-126 = 0
-21*x-126 = 0
-21*x-126 = 0 // + 126
-21*x = 126 // : -21
x = 126/(-21)
x = -6
x = -6
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