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56=2.5x+(12-x)5.75
We move all terms to the left:
56-(2.5x+(12-x)5.75)=0
We add all the numbers together, and all the variables
-(2.5x+(-1x+12)5.75)+56=0
We calculate terms in parentheses: -(2.5x+(-1x+12)5.75), so:We get rid of parentheses
2.5x+(-1x+12)5.75
We multiply parentheses
2.5x-5.75x+69
We add all the numbers together, and all the variables
-3.25x+69
Back to the equation:
-(-3.25x+69)
3.25x-69+56=0
We add all the numbers together, and all the variables
3.25x-13=0
We move all terms containing x to the left, all other terms to the right
3.25x=13
x=13/3.25
x=4
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