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2x-40+4x=35-9x
We move all terms to the left:
2x-40+4x-(35-9x)=0
We add all the numbers together, and all the variables
2x+4x-(-9x+35)-40=0
We add all the numbers together, and all the variables
6x-(-9x+35)-40=0
We get rid of parentheses
6x+9x-35-40=0
We add all the numbers together, and all the variables
15x-75=0
We move all terms containing x to the left, all other terms to the right
15x=75
x=75/15
x=5
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