Example

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

Question

$$(1+\frac{1}{x+1})(1+\frac{1}{x+2})(1+\frac{1}{x+3})(1+\frac{1}{x+4})$$

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