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(-1/6)*(x-18)+(1/2)*(x+2) = x+28 // - x+28
(-1/6)*(x-18)+(1/2)*(x+2)-x-28 = 0
1/2*(x+2)-1/6*(x-18)-x-28 = 0
1/2*(x+2)-1/6*(x-18)-x-28 = 0
1/3*x-x-28+4 = 0
4-2/3*x-28 = 0
-2/3*x-24 = 0
-2/3*x-24 = 0
-2/3*x-24 = 0 // + 24
-2/3*x = 24 // : -2/3
x = 24/(-2/3)
x = -36
x = -36
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