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(-1/9)*(x-18)+(1/5)*(x+5) = x-8 // - x-8
(-1/9)*(x-18)+(1/5)*(x+5)-x+8 = 0
1/5*(x+5)-1/9*(x-18)-x+8 = 0
1/5*(x+5)-1/9*(x-18)-x+8 = 0
4/45*x-x+3+8 = 0
3-41/45*x+8 = 0
11-41/45*x = 0
11-41/45*x = 0
11-41/45*x = 0 // - 11
-41/45*x = -11 // : -41/45
x = -11/(-41/45)
x = 495/41
x = 495/41
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