Example

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

Question

$$x ^ { 5 } - x ^ { 4 } + x ^ { 3 } - x ^ { 2 } + x - 5 x = - 1$$

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