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-2x+30=-x+20
We move all terms to the left:
-2x+30-(-x+20)=0
We add all the numbers together, and all the variables
-2x-(-1x+20)+30=0
We get rid of parentheses
-2x+1x-20+30=0
We add all the numbers together, and all the variables
-1x+10=0
We move all terms containing x to the left, all other terms to the right
-x=-10
x=-10/-1
x=+10
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