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20x+1000(400-x)=4200x
We move all terms to the left:
20x+1000(400-x)-(4200x)=0
We add all the numbers together, and all the variables
20x+1000(-1x+400)-4200x=0
We add all the numbers together, and all the variables
-4180x+1000(-1x+400)=0
We multiply parentheses
-4180x-1000x+400000=0
We add all the numbers together, and all the variables
-5180x+400000=0
We move all terms containing x to the left, all other terms to the right
-5180x=-400000
x=-400000/-5180
x=77+57/259
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