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(2/3)*x-((1/15)*y) = 0
(2/3)*x+(-1/15)*y = 0
2/3*x-1/15*y = 0 // + -1/15*y
2/3*x = -(-1/15*y) // : 2/3
x = (-(-1/15*y))/2/3
x = 1/10*y
x = 1/10*y
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