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457*x-(15/2) = 130 // - 130
457*x-(15/2)-130 = 0
457*x-15/2-130 = 0
457*x-275/2 = 0 // + 275/2
457*x = 275/2 // : 457
x = 275/2/457
x = 275/914
x = 275/914
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