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3*x-((3/5)*y) = -9 // + 9
3*x-((3/5)*y)+9 = 0
3*x+(-3/5)*y+9 = 0
3*x-3/5*y+9 = 0 // - 9-3/5*y
3*x = -(9-3/5*y) // : 3
x = (-(9-3/5*y))/3
x = (-(9-3/5*y))/3
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