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3x+12.3=5+x+12
We move all terms to the left:
3x+12.3-(5+x+12)=0
We add all the numbers together, and all the variables
3x-(x+17)+12.3=0
We get rid of parentheses
3x-x-17+12.3=0
We add all the numbers together, and all the variables
2x-4.7=0
We move all terms containing x to the left, all other terms to the right
2x=4.7
x=4.7/2
x=2+0.7/2
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