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9.70(138-x)+5.80x=1003.20
We move all terms to the left:
9.70(138-x)+5.80x-(1003.20)=0
We add all the numbers together, and all the variables
9.70(-1x+138)+5.80x-(1003.2)=0
We add all the numbers together, and all the variables
5.80x+9.70(-1x+138)-1003.2=0
We multiply parentheses
5.80x-9.7x+1338.6-1003.2=0
We add all the numbers together, and all the variables
-3.9x+335.4=0
We move all terms containing x to the left, all other terms to the right
-3.9x=-335.4
x=-335.4/-3.9
x=+86
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