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71=3x+8
We move all terms to the left:
71-(3x+8)=0
We get rid of parentheses
-3x-8+71=0
We add all the numbers together, and all the variables
-3x+63=0
We move all terms containing x to the left, all other terms to the right
-3x=-63
x=-63/-3
x=+21
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