20x+25(1000-x)=21000

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Solution for 20x+25(1000-x)=21000 equation: 



20x+25(1000-x)=21000

We move all terms to the left:

20x+25(1000-x)-(21000)=0

We add all the numbers together, and all the variables

20x+25(-1x+1000)-21000=0

We multiply parentheses

20x-25x+25000-21000=0

We add all the numbers together, and all the variables

-5x+4000=0

We move all terms containing x to the left, all other terms to the right

-5x=-4000

x=-4000/-5

x=+800

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