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(-1/6)*(x-18)+(1/2)*(x+2) = 0
1/2*(x+2)-1/6*(x-18) = 0
1/2*(x+2)-1/6*(x-18) = 0
1/3*x+4 = 0
1/3*x+4 = 0
1/3*x+4 = 0 // - 4
1/3*x = -4 // : 1/3
x = -4/1/3
x = -12
x = -12
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