Example

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

Question

$$( \frac { 3 } { 4 } + 5 \frac { 9 } { 10 } ) + ( 7 \frac { 2 } { 3 } - \frac { 1 } { 8 } )$$

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