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-3x+19=4x+40
We move all terms to the left:
-3x+19-(4x+40)=0
We get rid of parentheses
-3x-4x-40+19=0
We add all the numbers together, and all the variables
-7x-21=0
We move all terms containing x to the left, all other terms to the right
-7x=21
x=21/-7
x=-3
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