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5x+2+7x=5+9
We move all terms to the left:
5x+2+7x-(5+9)=0
We add all the numbers together, and all the variables
5x+7x+2-14=0
We add all the numbers together, and all the variables
12x-12=0
We move all terms containing x to the left, all other terms to the right
12x=12
x=12/12
x=1
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