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(2/5)*x-((9/4)*x)-6-1 = 0
(2/5)*x+(-9/4)*x-6-1 = 0
-37/20*x-7 = 0 // + 7
-37/20*x = 7 // : -37/20
x = 7/(-37/20)
x = -140/37
x = -140/37
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