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(1/15)*x-(4/5) = 2/3 // - 2/3
(1/15)*x-(4/5)-(2/3) = 0
(1/15)*x-4/5-2/3 = 0
1/15*x-22/15 = 0 // + 22/15
1/15*x = 22/15 // : 1/15
x = 22/15/1/15
x = 22
x = 22
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