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x+31+100-x/2=180
We move all terms to the left:
x+31+100-x/2-(180)=0
We add all the numbers together, and all the variables
x-x/2-49=0
We multiply all the terms by the denominator
x*2-x-49*2=0
We add all the numbers together, and all the variables
-1x+x*2-98=0
Wy multiply elements
-1x+2x-98=0
We add all the numbers together, and all the variables
x-98=0
We move all terms containing x to the left, all other terms to the right
x=98
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