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(4/5)*x-(2/9) = 3*x-(7/15) // - 3*x-(7/15)
(4/5)*x-(3*x)-(2/9)+7/15 = 0
(4/5)*x-3*x-2/9+7/15 = 0
11/45-11/5*x = 0 // - 11/45
-11/5*x = -11/45 // : -11/5
x = -11/45/(-11/5)
x = 1/9
x = 1/9
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