Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$20 \frac { 1 } { 10 } + 30 \frac { 1 } { 20 } + 10 \frac { 1 } { 50 }$$

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