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7.75x+4.5(18-x)=113.5
We move all terms to the left:
7.75x+4.5(18-x)-(113.5)=0
We add all the numbers together, and all the variables
7.75x+4.5(-1x+18)-(113.5)=0
We add all the numbers together, and all the variables
7.75x+4.5(-1x+18)-113.5=0
We multiply parentheses
7.75x-4.5x+81-113.5=0
We add all the numbers together, and all the variables
3.25x-32.5=0
We move all terms containing x to the left, all other terms to the right
3.25x=32.5
x=32.5/3.25
x=10
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