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5*x+(4*y)/5 = (5*x)/5 // - (5*x)/5
5*x-((5*x)/5)+(4*y)/5 = 0
5*x-x+(4*y)/5 = 0
4*x+4/5*y = 0 // - 4/5*y
4*x = -(4/5*y) // : 4
x = (-(4/5*y))/4
x = -1/5*y
x = -1/5*y
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