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4*x-2*x-(x*((9*y)/4))-(x*((3*y)/8))+1 = 0
4*x-2*x+(-9/4)*x*y+(-3/8)*x*y+1 = 0
1-21/8*x*y = 0 // - 1
-21/8*x*y = -1 // : -21/8*y
x = -1/(-21/8*y)
x = 8/21*y^-1
x = 8/21*y^-1
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