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(5/8)*x-((2/3)*y) = 3 // - 3
(5/8)*x-((2/3)*y)-3 = 0
(5/8)*x+(-2/3)*y-3 = 0
5/8*x-2/3*y-3 = 0 // + -2/3*y-3
5/8*x = -(-2/3*y-3) // : 5/8
x = (-(-2/3*y-3))/5/8
x = 8/5*(3-(-2/3*y))
x = 8/5*(3-(-2/3*y))
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