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(1/5)*(3*x-(0/5))-(1/30) = x/5 // - x/5
(1/5)*(3*x-(0/5))-(x/5)-(1/30) = 0
3*(1/5)*x-(x/5)-1/30 = 0
2/5*x-1/30 = 0 // + 1/30
2/5*x = 1/30 // : 2/5
x = 1/30/2/5
x = 1/12
x = 1/12
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