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7-(5-x)=77
We move all terms to the left:
7-(5-x)-(77)=0
We add all the numbers together, and all the variables
-(-1x+5)+7-77=0
We add all the numbers together, and all the variables
-(-1x+5)-70=0
We get rid of parentheses
1x-5-70=0
We add all the numbers together, and all the variables
x-75=0
We move all terms containing x to the left, all other terms to the right
x=75
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