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123=x+9x/2
We move all terms to the left:
123-(x+9x/2)=0
We add all the numbers together, and all the variables
-(+x+9x/2)+123=0
We get rid of parentheses
-x-9x/2+123=0
We multiply all the terms by the denominator
-x*2-9x+123*2=0
We add all the numbers together, and all the variables
-9x-x*2+246=0
Wy multiply elements
-9x-2x+246=0
We add all the numbers together, and all the variables
-11x+246=0
We move all terms containing x to the left, all other terms to the right
-11x=-246
x=-246/-11
x=22+4/11
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