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15x+4=7x+8x+4
We move all terms to the left:
15x+4-(7x+8x+4)=0
We add all the numbers together, and all the variables
15x-(15x+4)+4=0
We get rid of parentheses
15x-15x-4+4=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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