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(3/5)*x-((9/4)*x)-6-1 = 0
(3/5)*x+(-9/4)*x-6-1 = 0
-33/20*x-7 = 0 // + 7
-33/20*x = 7 // : -33/20
x = 7/(-33/20)
x = -140/33
x = -140/33
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