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61/5 = (-2/3)*x+6*x+9 // - (-2/3)*x+6*x+9
61/5-((-2/3)*x)-(6*x)-9 = 0
(2/3)*x-6*x+61/5-9 = 0
16/5-16/3*x = 0 // - 16/5
-16/3*x = -16/5 // : -16/3
x = -16/5/(-16/3)
x = 3/5
x = 3/5
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