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4x+20=x+19
We move all terms to the left:
4x+20-(x+19)=0
We get rid of parentheses
4x-x-19+20=0
We add all the numbers together, and all the variables
3x+1=0
We move all terms containing x to the left, all other terms to the right
3x=-1
x=-1/3
x=-1/3
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