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(4/5)*x-4 = (-2/3)*x // - (-2/3)*x
(4/5)*x-((-2/3)*x)-4 = 0
(4/5)*x+(2/3)*x-4 = 0
22/15*x-4 = 0 // + 4
22/15*x = 4 // : 22/15
x = 4/22/15
x = 30/11
x = 30/11
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