3x+4x=12-3

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Solution for 3x+4x=12-3 equation: 



3x+4x=12-3

We move all terms to the left:

3x+4x-(12-3)=0

We add all the numbers together, and all the variables

3x+4x-9=0

We add all the numbers together, and all the variables

7x-9=0

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

7x=9

x=9/7

x=1+2/7

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