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-130=-10(k+3)
We move all terms to the left:
-130-(-10(k+3))=0
We calculate terms in parentheses: -(-10(k+3)), so:We get rid of parentheses
-10(k+3)
We multiply parentheses
-10k-30
Back to the equation:
-(-10k-30)
10k+30-130=0
We add all the numbers together, and all the variables
10k-100=0
We move all terms containing k to the left, all other terms to the right
10k=100
k=100/10
k=10
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