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0.05n+0.10(n=7)=3.55
We move all terms to the left:
0.05n+0.10(n-(7))=0
We multiply parentheses
0.05n+0.1n-0.7=0
We add all the numbers together, and all the variables
0.15n-0.7=0
We move all terms containing n to the left, all other terms to the right
0.15n=0.7
n=0.7/0.15
n=4+0.1/0.15
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