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12.4+0.8x=8.8
We move all terms to the left:
12.4+0.8x-(8.8)=0
We add all the numbers together, and all the variables
0.8x+3.6=0
We move all terms containing x to the left, all other terms to the right
0.8x=-3.6
x=-3.6/0.8
x=-4+0.4/0.8
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