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3.1x+3.5=-26.4
We move all terms to the left:
3.1x+3.5-(-26.4)=0
We add all the numbers together, and all the variables
3.1x+29.9=0
We move all terms containing x to the left, all other terms to the right
3.1x=-29.9
x=-29.9/3.1
x=-9+1/1.55
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