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4x-9=4x-20+1+x
We move all terms to the left:
4x-9-(4x-20+1+x)=0
We add all the numbers together, and all the variables
4x-(5x-19)-9=0
We get rid of parentheses
4x-5x+19-9=0
We add all the numbers together, and all the variables
-1x+10=0
We move all terms containing x to the left, all other terms to the right
-x=-10
x=-10/-1
x=+10
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