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2.2x+15.9=-11.5
We move all terms to the left:
2.2x+15.9-(-11.5)=0
We add all the numbers together, and all the variables
2.2x+27.4=0
We move all terms containing x to the left, all other terms to the right
2.2x=-27.4
x=-27.4/2.2
x=-12+1/2.2
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