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(4/5)*x-((2/3)*y) = 5/8 // - 5/8
(4/5)*x-((2/3)*y)-(5/8) = 0
(4/5)*x+(-2/3)*y-5/8 = 0
4/5*x-2/3*y-5/8 = 0 // + -2/3*y-5/8
4/5*x = -(-2/3*y-5/8) // : 4/5
x = (-(-2/3*y-5/8))/4/5
x = 5/4*(5/8-(-2/3*y))
x = 5/4*(5/8-(-2/3*y))
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