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6.5x+5.5(400-x)=2390
We move all terms to the left:
6.5x+5.5(400-x)-(2390)=0
We add all the numbers together, and all the variables
6.5x+5.5(-1x+400)-2390=0
We multiply parentheses
6.5x-5.5x+2200-2390=0
We add all the numbers together, and all the variables
x-190=0
We move all terms containing x to the left, all other terms to the right
x=190
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