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6.5x+9.7+8.9x=209.9
We move all terms to the left:
6.5x+9.7+8.9x-(209.9)=0
We add all the numbers together, and all the variables
15.4x-200.2=0
We move all terms containing x to the left, all other terms to the right
15.4x=200.2
x=200.2/15.4
x=12+1/1
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