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-21=-5(6k+2)
We move all terms to the left:
-21-(-5(6k+2))=0
We calculate terms in parentheses: -(-5(6k+2)), so:We get rid of parentheses
-5(6k+2)
We multiply parentheses
-30k-10
Back to the equation:
-(-30k-10)
30k+10-21=0
We add all the numbers together, and all the variables
30k-11=0
We move all terms containing k to the left, all other terms to the right
30k=11
k=11/30
k=11/30
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