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7x-71=29+3x
We move all terms to the left:
7x-71-(29+3x)=0
We add all the numbers together, and all the variables
7x-(3x+29)-71=0
We get rid of parentheses
7x-3x-29-71=0
We add all the numbers together, and all the variables
4x-100=0
We move all terms containing x to the left, all other terms to the right
4x=100
x=100/4
x=25
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