4(x+1)+9=2x+21

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Solution for 4(x+1)+9=2x+21 equation: 



4(x+1)+9=2x+21

We move all terms to the left:

4(x+1)+9-(2x+21)=0

We multiply parentheses

4x-(2x+21)+4+9=0

We get rid of parentheses

4x-2x-21+4+9=0

We add all the numbers together, and all the variables

2x-8=0

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

2x=8

x=8/2

x=4

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