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x in (-oo:+oo)
-(2*((-3/5)*x+3))-2*x = 4 // - 4
-(2*((-3/5)*x+3))-2*x-4 = 0
-2*((-3/5)*x+3)-2*x-4 = 0
-2*(3-3/5*x)-2*x-4 = 0
-2*(3-3/5*x)-2*x-4 = 0
-4/5*x-6-4 = 0
-4/5*x-10 = 0
-4/5*x-10 = 0
-4/5*x-10 = 0 // + 10
-4/5*x = 10 // : -4/5
x = 10/(-4/5)
x = -25/2
x = -25/2
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