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(2/9)*x-(4/5) = 7/15 // - 7/15
(2/9)*x-(4/5)-(7/15) = 0
(2/9)*x-4/5-7/15 = 0
2/9*x-19/15 = 0 // + 19/15
2/9*x = 19/15 // : 2/9
x = 19/15/2/9
x = 57/10
x = 57/10
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