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4x-19=5x-12
We move all terms to the left:
4x-19-(5x-12)=0
We get rid of parentheses
4x-5x+12-19=0
We add all the numbers together, and all the variables
-1x-7=0
We move all terms containing x to the left, all other terms to the right
-x=7
x=7/-1
x=-7
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