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x+x+7/2-(2/4) = 15/4 // - 15/4
x+x+7/2-(2/4)-(15/4) = 0
x+x+7/2-1/2-15/4 = 0
2*x-3/4 = 0 // + 3/4
2*x = 3/4 // : 2
x = 3/4/2
x = 3/8
x = 3/8
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