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0.5x+9=-4x
We move all terms to the left:
0.5x+9-(-4x)=0
We get rid of parentheses
0.5x+4x+9=0
We add all the numbers together, and all the variables
4.5x+9=0
We move all terms containing x to the left, all other terms to the right
4.5x=-9
x=-9/4.5
x=-2
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