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100-2x=80+3
We move all terms to the left:
100-2x-(80+3)=0
We add all the numbers together, and all the variables
-2x+100-83=0
We add all the numbers together, and all the variables
-2x+17=0
We move all terms containing x to the left, all other terms to the right
-2x=-17
x=-17/-2
x=8+1/2
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