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180-90-\left(-x\right)
To find the opposite of 90-x, find the opposite of each term.
180-90+x
The opposite of -x is x.
90+x
Subtract 90 from 180 to get 90.
180-90-\left(-x\right)
To find the opposite of 90-x, find the opposite of each term.
180-90+x
The opposite of -x is x.
90+x
Subtract 90 from 180 to get 90.