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(3/5)*x-x-4 = -1 // + 1
(3/5)*x-x-4+1 = 0
-2/5*x-3 = 0 // + 3
-2/5*x = 3 // : -2/5
x = 3/(-2/5)
x = -15/2
x = -15/2
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