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4x+19=7x-20
We move all terms to the left:
4x+19-(7x-20)=0
We get rid of parentheses
4x-7x+20+19=0
We add all the numbers together, and all the variables
-3x+39=0
We move all terms containing x to the left, all other terms to the right
-3x=-39
x=-39/-3
x=+13
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