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-5.2+x-3x=18
We move all terms to the left:
-5.2+x-3x-(18)=0
We add all the numbers together, and all the variables
-2x-23.2=0
We move all terms containing x to the left, all other terms to the right
-2x=23.2
x=23.2/-2
x=-11+1/1.6666666666667
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