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(5/6)*x-4*x-(5/6) = -221/60 // + -221/60
(5/6)*x-4*x-(5/6)-(-221/60) = 0
(5/6)*x-4*x-5/6+221/60 = 0
57/20-19/6*x = 0 // - 57/20
-19/6*x = -57/20 // : -19/6
x = -57/20/(-19/6)
x = 9/10
x = 9/10
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