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(3/4)*x+(3/7)*y = 3/5 // - 3/5
(3/4)*x+(3/7)*y-(3/5) = 0
(3/4)*x+(3/7)*y-3/5 = 0
3/4*x+3/7*y-3/5 = 0 // - 3/7*y-3/5
3/4*x = -(3/7*y-3/5) // : 3/4
x = (-(3/7*y-3/5))/3/4
x = 4/3*(3/5-(3/7*y))
x = 4/3*(3/5-(3/7*y))
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