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0.05n+0.10(n+9)+0.25((n+9)+21)=10.00
We move all terms to the left:
0.05n+0.10(n+9)+0.25((n+9)+21)-(10.00)=0
We add all the numbers together, and all the variables
0.05n+0.10(n+9)+0.25((n+9)+21)-10=0
We multiply parentheses
0.05n+0.1n+0.25((n+9)+21)+0.9-10=0
We add all the numbers together, and all the variables
0.15n+0.25((n+9)+21)-9.1=0
We move all terms containing n to the left, all other terms to the right
0.15n+0.25((n+9)+21)=9.1
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