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-13.9-7.5x=-97.3+6.4x
We move all terms to the left:
-13.9-7.5x-(-97.3+6.4x)=0
We add all the numbers together, and all the variables
-7.5x-(6.4x-97.3)-13.9=0
We get rid of parentheses
-7.5x-6.4x+97.3-13.9=0
We add all the numbers together, and all the variables
-13.9x+83.4=0
We move all terms containing x to the left, all other terms to the right
-13.9x=-83.4
x=-83.4/-13.9
x=+6
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