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(4/5)*x-(2/15) = 9/30 // - 9/30
(4/5)*x-(2/15)-(9/30) = 0
(4/5)*x-2/15-3/10 = 0
4/5*x-13/30 = 0 // + 13/30
4/5*x = 13/30 // : 4/5
x = 13/30/4/5
x = 13/24
x = 13/24
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