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4.2x+5=2.2x+4
We move all terms to the left:
4.2x+5-(2.2x+4)=0
We get rid of parentheses
4.2x-2.2x-4+5=0
We add all the numbers together, and all the variables
2x+1=0
We move all terms containing x to the left, all other terms to the right
2x=-1
x=-1/2
x=-1/2
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