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-9=-7(7k+3)+4(5k+3)
We move all terms to the left:
-9-(-7(7k+3)+4(5k+3))=0
We calculate terms in parentheses: -(-7(7k+3)+4(5k+3)), so:We get rid of parentheses
-7(7k+3)+4(5k+3)
We multiply parentheses
-49k+20k-21+12
We add all the numbers together, and all the variables
-29k-9
Back to the equation:
-(-29k-9)
29k+9-9=0
We add all the numbers together, and all the variables
29k=0
k=0/29
k=0
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