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18*x-((7*y)/4) = 0
18*x+(-7/4)*y = 0
18*x-7/4*y = 0 // + -7/4*y
18*x = -(-7/4*y) // : 18
x = (-(-7/4*y))/18
x = 7/72*y
x = 7/72*y
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