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2x=30-10x
We move all terms to the left:
2x-(30-10x)=0
We add all the numbers together, and all the variables
2x-(-10x+30)=0
We get rid of parentheses
2x+10x-30=0
We add all the numbers together, and all the variables
12x-30=0
We move all terms containing x to the left, all other terms to the right
12x=30
x=30/12
x=2+1/2
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