4x+3x-9=12

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Solution for 4x+3x-9=12 equation:



4x+3x-9=12
We move all terms to the left:
4x+3x-9-(12)=0
We add all the numbers together, and all the variables
7x-21=0
We move all terms containing x to the left, all other terms to the right
7x=21
x=21/7
x=3

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