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(3*x)/4 = 6*x-126 // - 6*x-126
(3*x)/4-(6*x)+126 = 0
(3*x)/4-6*x+126 = 0
126-21/4*x = 0 // - 126
-21/4*x = -126 // : -21/4
x = -126/(-21/4)
x = 24
x = 24
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