3x+6x=25-7

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Solution for 3x+6x=25-7 equation: 



3x+6x=25-7

We move all terms to the left:

3x+6x-(25-7)=0

We add all the numbers together, and all the variables

3x+6x-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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