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4x+-5+2x=13+9x-21
We move all terms to the left:
4x+-5+2x-(13+9x-21)=0
We add all the numbers together, and all the variables
4x+2x-(9x-8)-5+=0
We add all the numbers together, and all the variables
6x-(9x-8)=0
We get rid of parentheses
6x-9x+8=0
We add all the numbers together, and all the variables
-3x+8=0
We move all terms containing x to the left, all other terms to the right
-3x=-8
x=-8/-3
x=2+2/3
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