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k/7+21=-10
We move all terms to the left:
k/7+21-(-10)=0
We add all the numbers together, and all the variables
k/7+31=0
We multiply all the terms by the denominator
k+31*7=0
We add all the numbers together, and all the variables
k+217=0
We move all terms containing k to the left, all other terms to the right
k=-217
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