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(4/5)*x-(1/10) = 3/30 // - 3/30
(4/5)*x-(1/10)-(3/30) = 0
(4/5)*x-1/10-1/10 = 0
4/5*x-1/5 = 0 // + 1/5
4/5*x = 1/5 // : 4/5
x = 1/5/4/5
x = 1/4
x = 1/4
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