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12.2+2x=5x+3
We move all terms to the left:
12.2+2x-(5x+3)=0
We get rid of parentheses
2x-5x-3+12.2=0
We add all the numbers together, and all the variables
-3x+9.2=0
We move all terms containing x to the left, all other terms to the right
-3x=-9.2
x=-9.2/-3
x=3+0.2/3
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