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x in (-oo:+oo)
(2/5)*(-(2*x)-3) = 18/5 // - 18/5
(2/5)*(-(2*x)-3)-(18/5) = 0
(2/5)*(-2*x-3)-18/5 = 0
2/5*(-2*x-3)-18/5 = 0
(2/5*5*(-2*x-3))/5-18/5 = 0
2/5*5*(-2*x-3)-18 = 0
-4*x-24 = 0
(-4*x-24)/5 = 0
(-4*x-24)/5 = 0 // * 5
-4*x-24 = 0
-4*x-24 = 0 // + 24
-4*x = 24 // : -4
x = 24/(-4)
x = -6
x = -6
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