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-2.5n-4=-4.2n+2
We move all terms to the left:
-2.5n-4-(-4.2n+2)=0
We get rid of parentheses
-2.5n+4.2n-2-4=0
We add all the numbers together, and all the variables
1.7n-6=0
We move all terms containing n to the left, all other terms to the right
1.7n=6
n=6/1.7
n=3+0.9/1.7
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