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6*x-((2/3)*(6*x-(15*y))) = 0
(-2/3)*(6*x-15*y)+6*x = 0
6*x-2/3*(6*x-15*y) = 0
6*x-2/3*(6*x-15*y) = 0
2*x+10*y = 0
2*x+10*y = 0
2*x+10*y = 0 // - 10*y
2*x = -(10*y) // : 2
x = (-(10*y))/2
x = -5*y
x = -5*y
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