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(3/4)*x-((2/5)*y) = 10 // - 10
(3/4)*x-((2/5)*y)-10 = 0
(3/4)*x+(-2/5)*y-10 = 0
3/4*x-2/5*y-10 = 0 // + -2/5*y-10
3/4*x = -(-2/5*y-10) // : 3/4
x = (-(-2/5*y-10))/3/4
x = 4/3*(10-(-2/5*y))
x = 4/3*(10-(-2/5*y))
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