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2(x+4.20)=22.40
We move all terms to the left:
2(x+4.20)-(22.40)=0
We add all the numbers together, and all the variables
2(x+4.2)-(22.4)=0
We add all the numbers together, and all the variables
2(x+4.2)-22.4=0
We multiply parentheses
2x+8.4-22.4=0
We add all the numbers together, and all the variables
2x-14=0
We move all terms containing x to the left, all other terms to the right
2x=14
x=14/2
x=7
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