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4*(4*x-1)-(7*x) = 3/8 // - 3/8
4*(4*x-1)-(7*x)-(3/8) = 0
4*(4*x-1)-7*x-3/8 = 0
(4*8*(4*x-1))/8+(-7*8*x)/8-3/8 = 0
4*8*(4*x-1)-7*8*x-3 = 0
72*x-32-3 = 0
72*x-35 = 0
(72*x-35)/8 = 0
(72*x-35)/8 = 0 // * 8
72*x-35 = 0
72*x-35 = 0 // + 35
72*x = 35 // : 72
x = 35/72
x = 35/72
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