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(5/6)*x-((3/5)*x) = (9/10)*x-9 // - (9/10)*x-9
(5/6)*x-((3/5)*x)-((9/10)*x)+9 = 0
(5/6)*x+(-3/5)*x+(-9/10)*x+9 = 0
9-2/3*x = 0 // - 9
-2/3*x = -9 // : -2/3
x = -9/(-2/3)
x = 27/2
x = 27/2
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