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15.8+0.8x=21.4
We move all terms to the left:
15.8+0.8x-(21.4)=0
We add all the numbers together, and all the variables
0.8x-5.6=0
We move all terms containing x to the left, all other terms to the right
0.8x=5.6
x=5.6/0.8
x=6+0.8/0.8
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