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19x-15=20x+16
We move all terms to the left:
19x-15-(20x+16)=0
We get rid of parentheses
19x-20x-16-15=0
We add all the numbers together, and all the variables
-1x-31=0
We move all terms containing x to the left, all other terms to the right
-x=31
x=31/-1
x=-31
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