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(2x-1)+(x)+(x+9)=40
We move all terms to the left:
(2x-1)+(x)+(x+9)-(40)=0
We add all the numbers together, and all the variables
x+(2x-1)+(x+9)-40=0
We get rid of parentheses
x+2x+x-1+9-40=0
We add all the numbers together, and all the variables
4x-32=0
We move all terms containing x to the left, all other terms to the right
4x=32
x=32/4
x=8
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