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-21-6i=-7(3i-8)-2
We move all terms to the left:
-21-6i-(-7(3i-8)-2)=0
We calculate terms in parentheses: -(-7(3i-8)-2), so:We get rid of parentheses
-7(3i-8)-2
We multiply parentheses
-21i+56-2
We add all the numbers together, and all the variables
-21i+54
Back to the equation:
-(-21i+54)
-6i+21i-54-21=0
We add all the numbers together, and all the variables
15i-75=0
We move all terms containing i to the left, all other terms to the right
15i=75
i=75/15
i=5
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