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2x+7x-4x=28+9+10-2
We move all terms to the left:
2x+7x-4x-(28+9+10-2)=0
We add all the numbers together, and all the variables
2x+7x-4x-45=0
We add all the numbers together, and all the variables
5x-45=0
We move all terms containing x to the left, all other terms to the right
5x=45
x=45/5
x=9
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