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7x+9x=5.8
We move all terms to the left:
7x+9x-(5.8)=0
We add all the numbers together, and all the variables
16x-5.8=0
We move all terms containing x to the left, all other terms to the right
16x=5.8
x=5.8/16
x=3.2222222222222/8.8888888888889
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