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30=20-2x
We move all terms to the left:
30-(20-2x)=0
We add all the numbers together, and all the variables
-(-2x+20)+30=0
We get rid of parentheses
2x-20+30=0
We add all the numbers together, and all the variables
2x+10=0
We move all terms containing x to the left, all other terms to the right
2x=-10
x=-10/2
x=-5
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