4x+(x+3)=18

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Solution for 4x+(x+3)=18 equation: 



4x+(x+3)=18

We move all terms to the left:

4x+(x+3)-(18)=0

We get rid of parentheses

4x+x+3-18=0

We add all the numbers together, and all the variables

5x-15=0

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

5x=15

x=15/5

x=3

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