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2(3)+1.25n=10
We move all terms to the left:
2(3)+1.25n-(10)=0
We add all the numbers together, and all the variables
1.25n+13=0
We move all terms containing n to the left, all other terms to the right
1.25n=-13
n=-13/1.25
n=-10+0.5/1.25
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