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-7(3k+2)=154
We move all terms to the left:
-7(3k+2)-(154)=0
We multiply parentheses
-21k-14-154=0
We add all the numbers together, and all the variables
-21k-168=0
We move all terms containing k to the left, all other terms to the right
-21k=168
k=168/-21
k=-8
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