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(3/4)*(4*x-12) = 3*(9-(7*x)) // - 3*(9-(7*x))
(3/4)*(4*x-12)-(3*(9-(7*x))) = 0
(3/4)*(4*x-12)-3*(9-7*x) = 0
3/4*(4*x-12)-3*(9-7*x) = 0
3/4*(4*x-12)-3*(9-7*x) = 0
24*x-36 = 0
24*x-36 = 0
24*x-36 = 0 // + 36
24*x = 36 // : 24
x = 36/24
x = 3/2
x = 3/2
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