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50-x=50-12.5
We move all terms to the left:
50-x-(50-12.5)=0
We add all the numbers together, and all the variables
-x+50-(37.5)=0
We add all the numbers together, and all the variables
-1x+12.5=0
We move all terms containing x to the left, all other terms to the right
-x=-12.5
x=-12.5/-1
x=12+0.5/1
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