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(30*x)/10-1 = x/4-x // - x/4-x
(30*x)/10-(x/4)+x-1 = 0
15/4*x-1 = 0 // + 1
15/4*x = 1 // : 15/4
x = 1/15/4
x = 4/15
x = 4/15
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