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