If you are talking about real number system then -X equals -80.
Else, if you are talking about vectors then -X will be another vector of magnitude 80, which will act along a direction just opposite to X (i.e., making an angle 180 degree with X).
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80
0.05 x 80 = 4
x2 = -80 x = (+/-)(-80).5 = (+/-)4isqrt(5)
x=5
To find the number that, when multiplied by 7, equals 560, you would divide 560 by 7. This would give you the answer of 80. Therefore, 80 multiplied by 7 equals 560.