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19x+4=21x+6
We move all terms to the left:
19x+4-(21x+6)=0
We get rid of parentheses
19x-21x-6+4=0
We add all the numbers together, and all the variables
-2x-2=0
We move all terms containing x to the left, all other terms to the right
-2x=2
x=2/-2
x=-1
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