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3x+20=4x-10+3x
We move all terms to the left:
3x+20-(4x-10+3x)=0
We add all the numbers together, and all the variables
3x-(7x-10)+20=0
We get rid of parentheses
3x-7x+10+20=0
We add all the numbers together, and all the variables
-4x+30=0
We move all terms containing x to the left, all other terms to the right
-4x=-30
x=-30/-4
x=7+1/2
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