.5x + 6.4 = 4.9 - 0.1x

I need this anwser ASAP. I'm a 7th grader, in AP Math, and everybody gets the same answer, but when I check my answer, it's wrong. Hope you can help me figure it out. Thanks.
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1 Answer

Given .5x + 6.4 = 4.9 - 0.1x
-4.9+6.4=-0.5x-0.1x
1.5=-0.6x
x=-2.5

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