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7*x-4*x+1/8 = 289/8 // - 289/8
7*x-4*x+1/8-(289/8) = 0
7*x-4*x+1/8-289/8 = 0
3*x-36 = 0 // + 36
3*x = 36 // : 3
x = 36/3
x = 12
x = 12
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