\[(2+3\imath )+(1-6\imath )-(8+7\imath )\]
1
Remove parentheses.
2+3ı+1−6ı−8−7ı2+3\imath +1-6\imath -8-7\imath

2
Collect like terms.
(2+1−8)+(3ı−6ı−7ı)(2+1-8)+(3\imath -6\imath -7\imath )

3
Simplify.
−5−10ı-5-10\imath

Done
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