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19-9x=21+9
We move all terms to the left:
19-9x-(21+9)=0
We add all the numbers together, and all the variables
-9x+19-30=0
We add all the numbers together, and all the variables
-9x-11=0
We move all terms containing x to the left, all other terms to the right
-9x=11
x=11/-9
x=-1+2/9
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