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7x+1+5x+3=12x+4
We move all terms to the left:
7x+1+5x+3-(12x+4)=0
We add all the numbers together, and all the variables
12x-(12x+4)+4=0
We get rid of parentheses
12x-12x-4+4=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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