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19x-4=15x+12
We move all terms to the left:
19x-4-(15x+12)=0
We get rid of parentheses
19x-15x-12-4=0
We add all the numbers together, and all the variables
4x-16=0
We move all terms containing x to the left, all other terms to the right
4x=16
x=16/4
x=4
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