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2.2x-15.8=4
We move all terms to the left:
2.2x-15.8-(4)=0
We add all the numbers together, and all the variables
2.2x-19.8=0
We move all terms containing x to the left, all other terms to the right
2.2x=19.8
x=19.8/2.2
x=9
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