3x+2(6x+21)=117

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Solution for 3x+2(6x+21)=117 equation: 



3x+2(6x+21)=117

We move all terms to the left:

3x+2(6x+21)-(117)=0

We multiply parentheses

3x+12x+42-117=0

We add all the numbers together, and all the variables

15x-75=0

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

15x=75

x=75/15

x=5

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