## 共享

3r+6s=2t-4

3r=2t-4-6s

3r=-6s+2t-4

\frac{3r}{3}=\frac{-6s+2t-4}{3}

r=\frac{-6s+2t-4}{3}

r=\frac{2t}{3}-2s-\frac{4}{3}
-4+2t-6s 除以 3。
3r+6s=2t-4

6s=2t-4-3r

6s=-3r+2t-4

\frac{6s}{6}=\frac{-3r+2t-4}{6}

s=\frac{-3r+2t-4}{6}

s=\frac{t}{3}-\frac{r}{2}-\frac{2}{3}
2t-4-3r 除以 6。
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