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2(4i+3)+3(2i-1)=31
We move all terms to the left:
2(4i+3)+3(2i-1)-(31)=0
We multiply parentheses
8i+6i+6-3-31=0
We add all the numbers together, and all the variables
14i-28=0
We move all terms containing i to the left, all other terms to the right
14i=28
i=28/14
i=2
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