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7+9x=25+7x-4
We move all terms to the left:
7+9x-(25+7x-4)=0
We add all the numbers together, and all the variables
9x-(7x+21)+7=0
We get rid of parentheses
9x-7x-21+7=0
We add all the numbers together, and all the variables
2x-14=0
We move all terms containing x to the left, all other terms to the right
2x=14
x=14/2
x=7
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