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12*x-(8/7) = 4 // - 4
12*x-(8/7)-4 = 0
12*x-8/7-4 = 0
12*x-36/7 = 0 // + 36/7
12*x = 36/7 // : 12
x = 36/7/12
x = 3/7
x = 3/7
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