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(100+x)990=792.7(780)-990
We move all terms to the left:
(100+x)990-(792.7(780)-990)=0
We add all the numbers together, and all the variables
(x+100)990-(-197.222)=0
We add all the numbers together, and all the variables
(x+100)990+197.222=0
We multiply parentheses
990x+99000+197.222=0
We add all the numbers together, and all the variables
990x+99197.222=0
We move all terms containing x to the left, all other terms to the right
990x=-99197.222
x=-99197.222/990
x=-100+161.392798691/810.147299513
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