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71=3.x+6.x-10
We move all terms to the left:
71-(3.x+6.x-10)=0
We add all the numbers together, and all the variables
-(9x-10)+71=0
We get rid of parentheses
-9x+10+71=0
We add all the numbers together, and all the variables
-9x+81=0
We move all terms containing x to the left, all other terms to the right
-9x=-81
x=-81/-9
x=+9
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