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2680=2(100-x)+3x+80
We move all terms to the left:
2680-(2(100-x)+3x+80)=0
We add all the numbers together, and all the variables
-(2(-1x+100)+3x+80)+2680=0
We calculate terms in parentheses: -(2(-1x+100)+3x+80), so:We get rid of parentheses
2(-1x+100)+3x+80
We add all the numbers together, and all the variables
3x+2(-1x+100)+80
We multiply parentheses
3x-2x+200+80
We add all the numbers together, and all the variables
x+280
Back to the equation:
-(x+280)
-x-280+2680=0
We add all the numbers together, and all the variables
-1x+2400=0
We move all terms containing x to the left, all other terms to the right
-x=-2400
x=-2400/-1
x=+2400
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