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3(4x+2x-1)=40
We move all terms to the left:
3(4x+2x-1)-(40)=0
We add all the numbers together, and all the variables
3(6x-1)-40=0
We multiply parentheses
18x-3-40=0
We add all the numbers together, and all the variables
18x-43=0
We move all terms containing x to the left, all other terms to the right
18x=43
x=43/18
x=2+7/18
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