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15*x-((2/3)*y) = 0
15*x+(-2/3)*y = 0
15*x-2/3*y = 0 // + -2/3*y
15*x = -(-2/3*y) // : 15
x = (-(-2/3*y))/15
x = 2/45*y
x = 2/45*y
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