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