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