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221/144 = (-3/4)*x+6*x+2/9 // - (-3/4)*x+6*x+2/9
221/144-((-3/4)*x)-(6*x)-(2/9) = 0
(3/4)*x-6*x+221/144-2/9 = 0
21/16-21/4*x = 0 // - 21/16
-21/4*x = -21/16 // : -21/4
x = -21/16/(-21/4)
x = 1/4
x = 1/4
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