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6-(7*x)-(5*x) = -126 // + 126
6-(7*x)-(5*x)+126 = 0
6-7*x-5*x+126 = 0
132-12*x = 0 // - 132
-12*x = -132 // : -12
x = -132/(-12)
x = 11
x = 11
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