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70=-5(2k-4)
We move all terms to the left:
70-(-5(2k-4))=0
We calculate terms in parentheses: -(-5(2k-4)), so:We get rid of parentheses
-5(2k-4)
We multiply parentheses
-10k+20
Back to the equation:
-(-10k+20)
10k-20+70=0
We add all the numbers together, and all the variables
10k+50=0
We move all terms containing k to the left, all other terms to the right
10k=-50
k=-50/10
k=-5
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