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x in (-oo:+oo)
(1/5)*(x+7) = (1/4)*(x+2)+1 // - (1/4)*(x+2)+1
(1/5)*(x+7)-((1/4)*(x+2))-1 = 0
(1/5)*(x+7)+(-1/4)*(x+2)-1 = 0
1/5*(x+7)-1/4*(x+2)-1 = 0
1/5*(x+7)-1/4*(x+2)-1 = 0
9/10-1/20*x-1 = 0
-1/20*x-1/10 = 0
-1/20*x-1/10 = 0
-1/20*x-1/10 = 0 // + 1/10
-1/20*x = 1/10 // : -1/20
x = 1/10/(-1/20)
x = -2
x = -2
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