2(n+1)+3(n-2)=21

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Solution for 2(n+1)+3(n-2)=21 equation: 



2(n+1)+3(n-2)=21

We move all terms to the left:

2(n+1)+3(n-2)-(21)=0

We multiply parentheses

2n+3n+2-6-21=0

We add all the numbers together, and all the variables

5n-25=0

We move all terms containing n to the left, all other terms to the right

5n=25

n=25/5

n=5

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