90-x=-100

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Solution for 90-x=-100 equation: 



90-x=-100

We move all terms to the left:

90-x-(-100)=0

We add all the numbers together, and all the variables

-1x+190=0

We move all terms containing x to the left, all other terms to the right

-x=-190

x=-190/-1

x=+190

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