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2*x-((6/5)*y) = -12 // + 12
2*x-((6/5)*y)+12 = 0
2*x+(-6/5)*y+12 = 0
2*x-6/5*y+12 = 0 // - 12-6/5*y
2*x = -(12-6/5*y) // : 2
x = (-(12-6/5*y))/2
x = (-(12-6/5*y))/2
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