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4.9x-7.86=3.9
We move all terms to the left:
4.9x-7.86-(3.9)=0
We add all the numbers together, and all the variables
4.9x-11.76=0
We move all terms containing x to the left, all other terms to the right
4.9x=11.76
x=11.76/4.9
x=2+1/2.5
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