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21.8-1.2x=4x+1
We move all terms to the left:
21.8-1.2x-(4x+1)=0
We get rid of parentheses
-1.2x-4x-1+21.8=0
We add all the numbers together, and all the variables
-5.2x+20.8=0
We move all terms containing x to the left, all other terms to the right
-5.2x=-20.8
x=-20.8/-5.2
x=+4
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