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-3+0.66+6n-42=-51
We move all terms to the left:
-3+0.66+6n-42-(-51)=0
We add all the numbers together, and all the variables
6n+6.66=0
We move all terms containing n to the left, all other terms to the right
6n=-6.66
n=-6.66/6
n=-1+0.66/6
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