Solve for x
x=-16
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100-20-\left(-x\right)=64
To find the opposite of 20-x, find the opposite of each term.
100-20+x=64
The opposite of -x is x.
80+x=64
Subtract 20 from 100 to get 80.
x=64-80
Subtract 80 from both sides.
x=-16
Subtract 80 from 64 to get -16.
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