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4x+5+5x=9x+12-7
We move all terms to the left:
4x+5+5x-(9x+12-7)=0
We add all the numbers together, and all the variables
4x+5x-(9x+5)+5=0
We add all the numbers together, and all the variables
9x-(9x+5)+5=0
We get rid of parentheses
9x-9x-5+5=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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