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x+1.7x=-2.8
We move all terms to the left:
x+1.7x-(-2.8)=0
We add all the numbers together, and all the variables
2.7x+2.8=0
We move all terms containing x to the left, all other terms to the right
2.7x=-2.8
x=-2.8/2.7
x=-1+0.1/2.7
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