42=-7(i-4)

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Solution for 42=-7(i-4) equation: 



42=-7(i-4)

We move all terms to the left:

42-(-7(i-4))=0



We calculate terms in parentheses: -(-7(i-4)), so:

-7(i-4)

We multiply parentheses

-7i+28

Back to the equation:

-(-7i+28)



We get rid of parentheses

7i-28+42=0

We add all the numbers together, and all the variables

7i+14=0

We move all terms containing i to the left, all other terms to the right

7i=-14

i=-14/7

i=-2

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