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21000=X-0.5X-0.25X-21000
We move all terms to the left:
21000-(X-0.5X-0.25X-21000)=0
We add all the numbers together, and all the variables
-(0.25X-21000)+21000=0
We get rid of parentheses
-0.25X+21000+21000=0
We add all the numbers together, and all the variables
-0.25X+42000=0
We move all terms containing X to the left, all other terms to the right
-0.25X=-42000
X=-42000/-0.25
X=+168000
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