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2x+6x+16.8=90
We move all terms to the left:
2x+6x+16.8-(90)=0
We add all the numbers together, and all the variables
8x-73.2=0
We move all terms containing x to the left, all other terms to the right
8x=73.2
x=73.2/8
x=9+1/6.6666666666667
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