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-23=3a-10
Combine 2a and a to get 3a.
3a-10=-23
Swap sides so that all variable terms are on the left hand side.
3a=-23+10
Add 10 to both sides.
3a=-13
Add -23 and 10 to get -13.
a=\frac{-13}{3}
Divide both sides by 3.
a=-\frac{13}{3}
Fraction \frac{-13}{3} can be rewritten as -\frac{13}{3} by extracting the negative sign.