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x in (-oo:+oo)
(1/5)*(x+10)-((1/7)*(x-7)) = x+2 // - x+2
(1/5)*(x+10)-((1/7)*(x-7))-x-2 = 0
(1/5)*(x+10)+(-1/7)*(x-7)-x-2 = 0
1/5*(x+10)-1/7*(x-7)-x-2 = 0
1/5*(x+10)-1/7*(x-7)-x-2 = 0
2/35*x-x-2+3 = 0
3-33/35*x-2 = 0
1-33/35*x = 0
1-33/35*x = 0
1-33/35*x = 0 // - 1
-33/35*x = -1 // : -33/35
x = -1/(-33/35)
x = 35/33
x = 35/33
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