7x+5x=3x+18

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Solution for 7x+5x=3x+18 equation: 



7x+5x=3x+18

We move all terms to the left:

7x+5x-(3x+18)=0

We add all the numbers together, and all the variables

12x-(3x+18)=0

We get rid of parentheses

12x-3x-18=0

We add all the numbers together, and all the variables

9x-18=0

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

9x=18

x=18/9

x=2

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