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4/9-x = (2/5)*x-(23/90) // - (2/5)*x-(23/90)
4/9-x-((2/5)*x)+23/90 = 0
(-2/5)*x-x+4/9+23/90 = 0
7/10-7/5*x = 0 // - 7/10
-7/5*x = -7/10 // : -7/5
x = -7/10/(-7/5)
x = 1/2
x = 1/2
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