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7.8x+3x=8.6
We move all terms to the left:
7.8x+3x-(8.6)=0
We add all the numbers together, and all the variables
10.8x-8.6=0
We move all terms containing x to the left, all other terms to the right
10.8x=8.6
x=8.6/10.8
x=3.3076923076923/4.1538461538462
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