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3.5=x/21000
We move all terms to the left:
3.5-(x/21000)=0
We add all the numbers together, and all the variables
-(+x/21000)+3.5=0
We get rid of parentheses
-x/21000+3.5=0
We multiply all the terms by the denominator
-x+(3.5)*21000=0
We add all the numbers together, and all the variables
-1x+73500=0
We move all terms containing x to the left, all other terms to the right
-x=-73500
x=-73500/-1
x=+73500
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