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(7/9)*x-((8/3)*x)+8*y-((1/5)*y) = 0
(7/9)*x+(-8/3)*x+8*y+(-1/5)*y = 0
39/5*y-17/9*x = 0 // - 39/5*y
-17/9*x = -(39/5*y) // : -17/9
x = (-(39/5*y))/(-17/9)
x = 351/85*y
x = 351/85*y
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