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(1/3)*x-(2*x)-((2/7)*y)+(3/7)*y = 0
(1/3)*x-2*x+(-2/7)*y+(3/7)*y = 0
1/7*y-5/3*x = 0 // - 1/7*y
-5/3*x = -(1/7*y) // : -5/3
x = (-(1/7*y))/(-5/3)
x = 3/35*y
x = 3/35*y
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