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(2/5)*x-8 = 9*(3/4)*x // - 9*(3/4)*x
(2/5)*x-(9*(3/4)*x)-8 = 0
(2/5)*x+(-27/4)*x-8 = 0
-127/20*x-8 = 0 // + 8
-127/20*x = 8 // : -127/20
x = 8/(-127/20)
x = -160/127
x = -160/127
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