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4x-15+2x=6+6x-21
We move all terms to the left:
4x-15+2x-(6+6x-21)=0
We add all the numbers together, and all the variables
4x+2x-(6x-15)-15=0
We add all the numbers together, and all the variables
6x-(6x-15)-15=0
We get rid of parentheses
6x-6x+15-15=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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