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