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(2/5)*x-((2/3)*y) = -15 // + 15
(2/5)*x-((2/3)*y)+15 = 0
(2/5)*x+(-2/3)*y+15 = 0
2/5*x-2/3*y+15 = 0 // - 15-2/3*y
2/5*x = -(15-2/3*y) // : 2/5
x = (-(15-2/3*y))/2/5
x = -5/2*(15-2/3*y)
x = -5/2*(15-2/3*y)
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