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11-x2=-5
add -11 to both sides:
11-x2-11=-5-11
-x2=-16
divide both sides by -2:
(-x2)/(-2)=(-16)/(-2)
x=8
If the "x2" was supposed to be "x2", meaning exponentiation, ("x squared") and not "x2", implying multiplication, ("x times two") then we'd get:
x2=16
x=±4
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