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12*x-(3*x)-(7/4) = 4 // - 4
12*x-(3*x)-(7/4)-4 = 0
12*x-3*x-7/4-4 = 0
9*x-23/4 = 0 // + 23/4
9*x = 23/4 // : 9
x = 23/4/9
x = 23/36
x = 23/36
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