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-31=-5(4k+6)
We move all terms to the left:
-31-(-5(4k+6))=0
We calculate terms in parentheses: -(-5(4k+6)), so:We get rid of parentheses
-5(4k+6)
We multiply parentheses
-20k-30
Back to the equation:
-(-20k-30)
20k+30-31=0
We add all the numbers together, and all the variables
20k-1=0
We move all terms containing k to the left, all other terms to the right
20k=1
k=1/20
k=1/20
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