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k=40/1+3-(3*7)+7-5
We move all terms to the left:
k-(40/1+3-(3*7)+7-5)=0
We add all the numbers together, and all the variables
k-(40/1+3-21+7-5)=0
We get rid of parentheses
k-3+21-7+5-40/1=0
We multiply all the terms by the denominator
k*1-40-3*1+21*1-7*1+5*1=0
We add all the numbers together, and all the variables
k*1-24=0
Wy multiply elements
k-24=0
We move all terms containing k to the left, all other terms to the right
k=24
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