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4x-19=2x+20
We move all terms to the left:
4x-19-(2x+20)=0
We get rid of parentheses
4x-2x-20-19=0
We add all the numbers together, and all the variables
2x-39=0
We move all terms containing x to the left, all other terms to the right
2x=39
x=39/2
x=19+1/2
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