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3*3x+4x=12
We move all terms to the left:
3*3x+4x-(12)=0
We add all the numbers together, and all the variables
4x+3*3x-12=0
Wy multiply elements
4x+9x-12=0
We add all the numbers together, and all the variables
13x-12=0
We move all terms containing x to the left, all other terms to the right
13x=12
x=12/13
x=12/13
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