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12x+3=4x+19
We move all terms to the left:
12x+3-(4x+19)=0
We get rid of parentheses
12x-4x-19+3=0
We add all the numbers together, and all the variables
8x-16=0
We move all terms containing x to the left, all other terms to the right
8x=16
x=16/8
x=2
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