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90n+0.1(90n)+12+30=600
We move all terms to the left:
90n+0.1(90n)+12+30-(600)=0
We add all the numbers together, and all the variables
90.19n-558=0
We move all terms containing n to the left, all other terms to the right
90.19n=558
n=558/90.19
n=6+5.8951048951049/31.534965034965
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