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2x+1=0
Add -7 and 8 to get 1.
2x=-1
Subtract 1 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-1}{2}
Divide both sides by 2.
x=-\frac{1}{2}
Fraction \frac{-1}{2} can be rewritten as -\frac{1}{2} by extracting the negative sign.