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20-3x=2x+30
We move all terms to the left:
20-3x-(2x+30)=0
We get rid of parentheses
-3x-2x-30+20=0
We add all the numbers together, and all the variables
-5x-10=0
We move all terms containing x to the left, all other terms to the right
-5x=10
x=10/-5
x=-2
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