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4(2n+5)=13n
We move all terms to the left:
4(2n+5)-(13n)=0
We add all the numbers together, and all the variables
-13n+4(2n+5)=0
We multiply parentheses
-13n+8n+20=0
We add all the numbers together, and all the variables
-5n+20=0
We move all terms containing n to the left, all other terms to the right
-5n=-20
n=-20/-5
n=+4
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