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(2/3)*(x-12) = (3/6)*(x-2) // - (3/6)*(x-2)
(2/3)*(x-12)-((3/6)*(x-2)) = 0
(2/3)*(x-12)+(-1/2)*(x-2) = 0
2/3*(x-12)-1/2*(x-2) = 0
2/3*(x-12)-1/2*(x-2) = 0
1/6*x-7 = 0
1/6*x-7 = 0
1/6*x-7 = 0 // + 7
1/6*x = 7 // : 1/6
x = 7/1/6
x = 42
x = 42
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