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5x+7=21-9x
We move all terms to the left:
5x+7-(21-9x)=0
We add all the numbers together, and all the variables
5x-(-9x+21)+7=0
We get rid of parentheses
5x+9x-21+7=0
We add all the numbers together, and all the variables
14x-14=0
We move all terms containing x to the left, all other terms to the right
14x=14
x=14/14
x=1
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