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3x+69=4x+19
We move all terms to the left:
3x+69-(4x+19)=0
We get rid of parentheses
3x-4x-19+69=0
We add all the numbers together, and all the variables
-1x+50=0
We move all terms containing x to the left, all other terms to the right
-x=-50
x=-50/-1
x=+50
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