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2x+9.75-7=-5.15
We move all terms to the left:
2x+9.75-7-(-5.15)=0
We add all the numbers together, and all the variables
2x+7.9=0
We move all terms containing x to the left, all other terms to the right
2x=-7.9
x=-7.9/2
x=-3+1/1.0526315789474
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