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4.9x-(-3)=12.8
We move all terms to the left:
4.9x-(-3)-(12.8)=0
We add all the numbers together, and all the variables
4.9x-9.8=0
We move all terms containing x to the left, all other terms to the right
4.9x=9.8
x=9.8/4.9
x=2
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