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10000=7x+x
We move all terms to the left:
10000-(7x+x)=0
We add all the numbers together, and all the variables
-(+8x)+10000=0
We get rid of parentheses
-8x+10000=0
We move all terms containing x to the left, all other terms to the right
-8x=-10000
x=-10000/-8
x=+1250
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