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12x+1.3=27.9+5x
We move all terms to the left:
12x+1.3-(27.9+5x)=0
We add all the numbers together, and all the variables
12x-(5x+27.9)+1.3=0
We get rid of parentheses
12x-5x-27.9+1.3=0
We add all the numbers together, and all the variables
7x-26.6=0
We move all terms containing x to the left, all other terms to the right
7x=26.6
x=26.6/7
x=3+3.5/4.375
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