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7(3+x)-x=25+7x
We move all terms to the left:
7(3+x)-x-(25+7x)=0
We add all the numbers together, and all the variables
7(x+3)-x-(7x+25)=0
We add all the numbers together, and all the variables
-1x+7(x+3)-(7x+25)=0
We multiply parentheses
-1x+7x-(7x+25)+21=0
We get rid of parentheses
-1x+7x-7x-25+21=0
We add all the numbers together, and all the variables
-1x-4=0
We move all terms containing x to the left, all other terms to the right
-x=4
x=4/-1
x=-4
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