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x in (-oo:+oo)
(-1/2)*(x+12)-(1*(x-1)) = x+5 // - x+5
(-1/2)*(x+12)-(1*(x-1))-x-5 = 0
(-1/2)*(x+12)-x-x-5+1 = 0
1-1/2*(x+12)-x-x-5 = 0
1-1/2*(x+12)-x-x-5 = 0
1-3/2*x-x-6-5 = 0
1-5/2*x-6-5 = 0
1-5/2*x-11 = 0
-5/2*x-10 = 0
-5/2*x-10 = 0
-5/2*x-10 = 0 // + 10
-5/2*x = 10 // : -5/2
x = 10/(-5/2)
x = -4
x = -4
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