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10n+20(n-5)+30n/4=350
We move all terms to the left:
10n+20(n-5)+30n/4-(350)=0
We multiply parentheses
10n+20n+30n/4-100-350=0
We multiply all the terms by the denominator
10n*4+20n*4+30n-100*4-350*4=0
We add all the numbers together, and all the variables
30n+10n*4+20n*4-1800=0
Wy multiply elements
30n+40n+80n-1800=0
We add all the numbers together, and all the variables
150n-1800=0
We move all terms containing n to the left, all other terms to the right
150n=1800
n=1800/150
n=12
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