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6x-4x=20-12+9
We move all terms to the left:
6x-4x-(20-12+9)=0
We add all the numbers together, and all the variables
6x-4x-17=0
We add all the numbers together, and all the variables
2x-17=0
We move all terms containing x to the left, all other terms to the right
2x=17
x=17/2
x=8+1/2
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