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