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4*x+3*y = (2*y)/5 // - (2*y)/5
4*x+3*y-((2*y)/5) = 0
4*x+3*y+(-2/5)*y = 0
4*x+13/5*y = 0 // - 13/5*y
4*x = -(13/5*y) // : 4
x = (-(13/5*y))/4
x = -13/20*y
x = -13/20*y
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