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