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100-(x/2)=x+31
We move all terms to the left:
100-(x/2)-(x+31)=0
We add all the numbers together, and all the variables
-(+x/2)-(x+31)+100=0
We get rid of parentheses
-x/2-x-31+100=0
We multiply all the terms by the denominator
-x-x*2-31*2+100*2=0
We add all the numbers together, and all the variables
-1x-x*2+138=0
Wy multiply elements
-1x-2x+138=0
We add all the numbers together, and all the variables
-3x+138=0
We move all terms containing x to the left, all other terms to the right
-3x=-138
x=-138/-3
x=+46
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