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20+6x=30+4x
We move all terms to the left:
20+6x-(30+4x)=0
We add all the numbers together, and all the variables
6x-(4x+30)+20=0
We get rid of parentheses
6x-4x-30+20=0
We add all the numbers together, and all the variables
2x-10=0
We move all terms containing x to the left, all other terms to the right
2x=10
x=10/2
x=5
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