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