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3x+8x-7x=9+15-2
We move all terms to the left:
3x+8x-7x-(9+15-2)=0
We add all the numbers together, and all the variables
3x+8x-7x-22=0
We add all the numbers together, and all the variables
4x-22=0
We move all terms containing x to the left, all other terms to the right
4x=22
x=22/4
x=5+1/2
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