Remove parentheses.

Add <math><mstyle displaystyle="true"><mn>2</mn></mstyle></math> and <math><mstyle displaystyle="true"><mn>5</mn></mstyle></math> .

Subtract <math><mstyle displaystyle="true"><mi>i</mi></mstyle></math> from <math><mstyle displaystyle="true"><mo>-</mo><mn>8</mn><mi>i</mi></mstyle></math> .

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