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(1/5)*(x+5)+(1/15)*(x-15) = x+11 // - x+11
(1/5)*(x+5)+(1/15)*(x-15)-x-11 = 0
1/5*(x+5)+1/15*(x-15)-x-11 = 0
1/5*(x+5)+1/15*(x-15)-x-11 = 0
4/15*x-x-11 = 0
-11/15*x-11 = 0
-11/15*x-11 = 0
-11/15*x-11 = 0 // + 11
-11/15*x = 11 // : -11/15
x = 11/(-11/15)
x = -15
x = -15
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