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(1/3)*x-((1/6)*y) = 6 // - 6
(1/3)*x-((1/6)*y)-6 = 0
(1/3)*x+(-1/6)*y-6 = 0
1/3*x-1/6*y-6 = 0 // + -1/6*y-6
1/3*x = -(-1/6*y-6) // : 1/3
x = (-(-1/6*y-6))/1/3
x = 3*(6-(-1/6*y))
x = 3*(6-(-1/6*y))
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