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x+2x+3+2.4=12
We move all terms to the left:
x+2x+3+2.4-(12)=0
We add all the numbers together, and all the variables
3x-6.6=0
We move all terms containing x to the left, all other terms to the right
3x=6.6
x=6.6/3
x=2+0.6/3
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