91=-5k+7(2k+4)

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Solution for 91=-5k+7(2k+4) equation:



91=-5k+7(2k+4)
We move all terms to the left:
91-(-5k+7(2k+4))=0
We calculate terms in parentheses: -(-5k+7(2k+4)), so:
-5k+7(2k+4)
We multiply parentheses
-5k+14k+28
We add all the numbers together, and all the variables
9k+28
Back to the equation:
-(9k+28)
We get rid of parentheses
-9k-28+91=0
We add all the numbers together, and all the variables
-9k+63=0
We move all terms containing k to the left, all other terms to the right
-9k=-63
k=-63/-9
k=+7

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