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8x+9(30000-x)=2500
We move all terms to the left:
8x+9(30000-x)-(2500)=0
We add all the numbers together, and all the variables
8x+9(-1x+30000)-2500=0
We multiply parentheses
8x-9x+270000-2500=0
We add all the numbers together, and all the variables
-1x+267500=0
We move all terms containing x to the left, all other terms to the right
-x=-267500
x=-267500/-1
x=+267500
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