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0.7*40+0.3x=39.6
We move all terms to the left:
0.7*40+0.3x-(39.6)=0
We add all the numbers together, and all the variables
0.3x-11.6=0
We move all terms containing x to the left, all other terms to the right
0.3x=11.6
x=11.6/0.3
x=38+0.2/0.3
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