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Tohaina

\frac{1}{2}a+\frac{1}{2}\left(-2\right)b-\frac{1}{3}\left(3a-b\right)
Whakamahia te āhuatanga tohatoha hei whakarea te \frac{1}{2} ki te a-2b.
\frac{1}{2}a+\frac{-2}{2}b-\frac{1}{3}\left(3a-b\right)
Whakareatia te \frac{1}{2} ki te -2, ka \frac{-2}{2}.
\frac{1}{2}a-b-\frac{1}{3}\left(3a-b\right)
Whakawehea te -2 ki te 2, kia riro ko -1.
\frac{1}{2}a-b-\frac{1}{3}\times 3a-\frac{1}{3}\left(-1\right)b
Whakamahia te āhuatanga tohatoha hei whakarea te -\frac{1}{3} ki te 3a-b.
\frac{1}{2}a-b-a-\frac{1}{3}\left(-1\right)b
Me whakakore te 3 me te 3.
\frac{1}{2}a-b-a+\frac{1}{3}b
Whakareatia te -\frac{1}{3} ki te -1, ka \frac{1}{3}.
-\frac{1}{2}a-b+\frac{1}{3}b
Pahekotia te \frac{1}{2}a me -a, ka -\frac{1}{2}a.
-\frac{1}{2}a-\frac{2}{3}b
Pahekotia te -b me \frac{1}{3}b, ka -\frac{2}{3}b.
\frac{1}{2}a+\frac{1}{2}\left(-2\right)b-\frac{1}{3}\left(3a-b\right)
Whakamahia te āhuatanga tohatoha hei whakarea te \frac{1}{2} ki te a-2b.
\frac{1}{2}a+\frac{-2}{2}b-\frac{1}{3}\left(3a-b\right)
Whakareatia te \frac{1}{2} ki te -2, ka \frac{-2}{2}.
\frac{1}{2}a-b-\frac{1}{3}\left(3a-b\right)
Whakawehea te -2 ki te 2, kia riro ko -1.
\frac{1}{2}a-b-\frac{1}{3}\times 3a-\frac{1}{3}\left(-1\right)b
Whakamahia te āhuatanga tohatoha hei whakarea te -\frac{1}{3} ki te 3a-b.
\frac{1}{2}a-b-a-\frac{1}{3}\left(-1\right)b
Me whakakore te 3 me te 3.
\frac{1}{2}a-b-a+\frac{1}{3}b
Whakareatia te -\frac{1}{3} ki te -1, ka \frac{1}{3}.
-\frac{1}{2}a-b+\frac{1}{3}b
Pahekotia te \frac{1}{2}a me -a, ka -\frac{1}{2}a.
-\frac{1}{2}a-\frac{2}{3}b
Pahekotia te -b me \frac{1}{3}b, ka -\frac{2}{3}b.