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8.8x+15-4.3x=20.4
We move all terms to the left:
8.8x+15-4.3x-(20.4)=0
We add all the numbers together, and all the variables
4.5x-5.4=0
We move all terms containing x to the left, all other terms to the right
4.5x=5.4
x=5.4/4.5
x=1+0.9/4.5
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