Example

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

Question

$$5.0+5.1-6.0+6.1-7.0+7.1-8.0+8.1-9.0+9.1-10.0$$

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