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70=10(k+3)
We move all terms to the left:
70-(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+70=0
We add all the numbers together, and all the variables
-10k+40=0
We move all terms containing k to the left, all other terms to the right
-10k=-40
k=-40/-10
k=+4
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