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x in (-oo:+oo)
5*(x+1/2) = 3*x+7*x+5 // - 3*x+7*x+5
5*(x+1/2)-(3*x)-(7*x)-5 = 0
5*(x+1/2)-3*x-7*x-5 = 0
5*(x+1/2)-3*x-7*x-5 = 0
2*x-7*x-5+5/2 = 0
5/2-5*x-5 = 0
-5*x-5/2 = 0
-5*x-5/2 = 0
-5*x-5/2 = 0 // + 5/2
-5*x = 5/2 // : -5
x = 5/2/(-5)
x = -1/2
x = -1/2
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