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30-9x=10+11x
We move all terms to the left:
30-9x-(10+11x)=0
We add all the numbers together, and all the variables
-9x-(11x+10)+30=0
We get rid of parentheses
-9x-11x-10+30=0
We add all the numbers together, and all the variables
-20x+20=0
We move all terms containing x to the left, all other terms to the right
-20x=-20
x=-20/-20
x=1
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