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2x+31=5x+19
We move all terms to the left:
2x+31-(5x+19)=0
We get rid of parentheses
2x-5x-19+31=0
We add all the numbers together, and all the variables
-3x+12=0
We move all terms containing x to the left, all other terms to the right
-3x=-12
x=-12/-3
x=+4
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