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70-(3x+11)=90
We move all terms to the left:
70-(3x+11)-(90)=0
We add all the numbers together, and all the variables
-(3x+11)-20=0
We get rid of parentheses
-3x-11-20=0
We add all the numbers together, and all the variables
-3x-31=0
We move all terms containing x to the left, all other terms to the right
-3x=31
x=31/-3
x=-10+1/3
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