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2.1=-0.6n
We move all terms to the left:
2.1-(-0.6n)=0
We get rid of parentheses
0.6n+2.1=0
We move all terms containing n to the left, all other terms to the right
0.6n=-2.1
n=-2.1/0.6
n=-3+0.3/0.6
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