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(-1/6)*(x-18)+1/2 = x+4 // - x+4
(-1/6)*(x-18)-x+1/2-4 = 0
1/2-1/6*(x-18)-x-4 = 0
(-1/6*2*(x-18))/2+(2*(-x))/2+1/2+(-4*2)/2 = 0
2*(-x)-1/6*2*(x-18)-4*2+1 = 0
1-7/3*x-8+6 = 0
7-7/3*x-8 = 0
-7/3*x-1 = 0
(-7/3*x-1)/2 = 0
(-7/3*x-1)/2 = 0 // * 2
-7/3*x-1 = 0
-7/3*x-1 = 0 // + 1
-7/3*x = 1 // : -7/3
x = 1/(-7/3)
x = -3/7
x = -3/7
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