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(-1/6)*(x-18)+(1/3)*(x+3) = 6-x // - 6-x
(-1/6)*(x-18)+(1/3)*(x+3)+x-6 = 0
1/3*(x+3)-1/6*(x-18)+x-6 = 0
1/3*(x+3)-1/6*(x-18)+x-6 = 0
1/6*x+x-6+4 = 0
7/6*x-6+4 = 0
7/6*x-2 = 0
7/6*x-2 = 0
7/6*x-2 = 0 // + 2
7/6*x = 2 // : 7/6
x = 2/7/6
x = 12/7
x = 12/7
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