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15.8=2x-7.2=
We move all terms to the left:
15.8-(2x-7.2)=0
We get rid of parentheses
-2x+7.2+15.8=0
We add all the numbers together, and all the variables
-2x+23=0
We move all terms containing x to the left, all other terms to the right
-2x=-23
x=-23/-2
x=11+1/2
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