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x in (-oo:+oo)
2/3 = (4/5)*x-((5/6)*x)+9/10 // - (4/5)*x-((5/6)*x)+9/10
(5/6)*x-((4/5)*x)+2/3-(9/10) = 0
(-4/5)*x+(5/6)*x+2/3-9/10 = 0
1/30*x-7/30 = 0 // + 7/30
1/30*x = 7/30 // : 1/30
x = 7/30/1/30
x = 7
x = 7
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