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