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(3/5)*x-((6/5)*x)-5 = 4 // - 4
(3/5)*x-((6/5)*x)-5-4 = 0
(3/5)*x+(-6/5)*x-5-4 = 0
-3/5*x-9 = 0 // + 9
-3/5*x = 9 // : -3/5
x = 9/(-3/5)
x = -15
x = -15
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