Example

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

Question

$$1 \frac { 3 } { 4 } - 2 \frac { 5 } { 6 } - 1 \frac { 9 } { 10 } + 4 \frac { 1 } { 8 }$$

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