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7x-19=5x+21
We move all terms to the left:
7x-19-(5x+21)=0
We get rid of parentheses
7x-5x-21-19=0
We add all the numbers together, and all the variables
2x-40=0
We move all terms containing x to the left, all other terms to the right
2x=40
x=40/2
x=20
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