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x in (-oo:+oo)
1*(x+2)-((1/3)*(x-3)) = x-7 // - x-7
1*(x+2)-((1/3)*(x-3))-x+7 = 0
(-1/3)*(x-3)+x-x+2+7 = 0
x-1/3*(x-3)-x+2+7 = 0
x-1/3*(x-3)-x+2+7 = 0
2/3*x-x+1+2+7 = 0
1-1/3*x+2+7 = 0
3-1/3*x+7 = 0
10-1/3*x = 0
10-1/3*x = 0
10-1/3*x = 0 // - 10
-1/3*x = -10 // : -1/3
x = -10/(-1/3)
x = 30
x = 30
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