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x in (-oo:+oo)
(-1/2)*x-3 = -65/24 // + -65/24
(-1/2)*x-(-65/24)-3 = 0
(-1/2)*x+65/24-3 = 0
-1/2*x-7/24 = 0 // + 7/24
-1/2*x = 7/24 // : -1/2
x = 7/24/(-1/2)
x = -7/12
x = -7/12
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