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x in (-oo:+oo)
-25 = 2*x+2*x+3 // - 2*x+2*x+3
-(2*x)-(2*x)-25-3 = 0
-2*x-2*x-25-3 = 0
-4*x-28 = 0 // + 28
-4*x = 28 // : -4
x = 28/(-4)
x = -7
x = -7
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