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(3*y)/8-9 = 3*x+13 // - 3*x+13
(3*y)/8-(3*x)-13-9 = 0
(3*y)/8-3*x-13-9 = 0
3/8*y-3*x-22 = 0 // - 3/8*y-22
-3*x = -(3/8*y-22) // : -3
x = (-(3/8*y-22))/(-3)
x = (22-(3/8*y))/(-3)
x = (22-(3/8*y))/(-3)
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