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9000=20-4x
We move all terms to the left:
9000-(20-4x)=0
We add all the numbers together, and all the variables
-(-4x+20)+9000=0
We get rid of parentheses
4x-20+9000=0
We add all the numbers together, and all the variables
4x+8980=0
We move all terms containing x to the left, all other terms to the right
4x=-8980
x=-8980/4
x=-2245
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