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(299.792.458+x)=-100
We move all terms to the left:
(299.792.458+x)-(-100)=0
We add all the numbers together, and all the variables
(x+137.304736)-(-100)=0
We add all the numbers together, and all the variables
(x+137.304736)+100=0
We get rid of parentheses
x+137.304736+100=0
We add all the numbers together, and all the variables
x+237.304736=0
We move all terms containing x to the left, all other terms to the right
x=-237.304736
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