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70-30=-3k-5k
We move all terms to the left:
70-30-(-3k-5k)=0
We add all the numbers together, and all the variables
-(-8k)+70-30=0
We add all the numbers together, and all the variables
-(-8k)+40=0
We get rid of parentheses
8k+40=0
We move all terms containing k to the left, all other terms to the right
8k=-40
k=-40/8
k=-5
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