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39-10x=20+9x
We move all terms to the left:
39-10x-(20+9x)=0
We add all the numbers together, and all the variables
-10x-(9x+20)+39=0
We get rid of parentheses
-10x-9x-20+39=0
We add all the numbers together, and all the variables
-19x+19=0
We move all terms containing x to the left, all other terms to the right
-19x=-19
x=-19/-19
x=1
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