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(1/3)*x-((1/6)*y) = -4 // + 4
(1/3)*x-((1/6)*y)+4 = 0
(1/3)*x+(-1/6)*y+4 = 0
1/3*x-1/6*y+4 = 0 // - 4-1/6*y
1/3*x = -(4-1/6*y) // : 1/3
x = (-(4-1/6*y))/1/3
x = -3*(4-1/6*y)
x = -3*(4-1/6*y)
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