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255/6 = (17*x)/4 // - (17*x)/4
255/6-((17*x)/4) = 0
(-17/4)*x+255/6 = 0
85/2-17/4*x = 0 // - 85/2
-17/4*x = -85/2 // : -17/4
x = -85/2/(-17/4)
x = 10
x = 10
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