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x in (-oo:+oo)
(-5/6)*x+1 = 21/16 // - 21/16
(-5/6)*x-(21/16)+1 = 0
(-5/6)*x-21/16+1 = 0
-5/6*x-5/16 = 0 // + 5/16
-5/6*x = 5/16 // : -5/6
x = 5/16/(-5/6)
x = -3/8
x = -3/8
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