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2.6-7.5(4.2+2.2n)=-139.45
We move all terms to the left:
2.6-7.5(4.2+2.2n)-(-139.45)=0
We add all the numbers together, and all the variables
-7.5(2.2n+4.2)+2.6-(-139.45)=0
We add all the numbers together, and all the variables
-7.5(2.2n+4.2)+142.05=0
We multiply parentheses
-15n-31.5+142.05=0
We add all the numbers together, and all the variables
-15n+110.55=0
We move all terms containing n to the left, all other terms to the right
-15n=-110.55
n=-110.55/-15
n=7+1/2.7027027027027
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