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(4/5)*x-((9/4)*x)-6-3 = 0
(4/5)*x+(-9/4)*x-6-3 = 0
-29/20*x-9 = 0 // + 9
-29/20*x = 9 // : -29/20
x = 9/(-29/20)
x = -180/29
x = -180/29
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