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