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3(120-x)+6x=765
We move all terms to the left:
3(120-x)+6x-(765)=0
We add all the numbers together, and all the variables
3(-1x+120)+6x-765=0
We add all the numbers together, and all the variables
6x+3(-1x+120)-765=0
We multiply parentheses
6x-3x+360-765=0
We add all the numbers together, and all the variables
3x-405=0
We move all terms containing x to the left, all other terms to the right
3x=405
x=405/3
x=135
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