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0.8x+9.9=-1.4x
We move all terms to the left:
0.8x+9.9-(-1.4x)=0
We get rid of parentheses
0.8x+1.4x+9.9=0
We add all the numbers together, and all the variables
2.2x+9.9=0
We move all terms containing x to the left, all other terms to the right
2.2x=-9.9
x=-9.9/2.2
x=-4+1/2
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