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x+(x-4)=72
We move all terms to the left:
x+(x-4)-(72)=0
We get rid of parentheses
x+x-4-72=0
We add all the numbers together, and all the variables
2x-76=0
We move all terms containing x to the left, all other terms to the right
2x=76
x=76/2
x=38
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