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7.2x+8.4+6.4x+7.5=105.66
We move all terms to the left:
7.2x+8.4+6.4x+7.5-(105.66)=0
We add all the numbers together, and all the variables
13.6x-89.76=0
We move all terms containing x to the left, all other terms to the right
13.6x=89.76
x=89.76/13.6
x=6+7.0344827586206/11.724137931034
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