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