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(7/15)*x-(1/4) = 4 // - 4
(7/15)*x-(1/4)-4 = 0
(7/15)*x-1/4-4 = 0
7/15*x-17/4 = 0 // + 17/4
7/15*x = 17/4 // : 7/15
x = 17/4/7/15
x = 255/28
x = 255/28
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