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5*x-x+x*((8*y)/8)-(x*((7*y)/4))+3 = 0
5*x-x+x*((8*y)/8)+(-7/4)*x*y+3 = 0
3-3/4*x*y = 0 // - 3
-3/4*x*y = -3 // : -3/4*y
x = -3/(-3/4*y)
x = 4*y^-1
x = 4*y^-1
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