It is known that a B is opposite to each other, C D is reciprocal to each other, and the absolute value of X is 5 to find the value of X + 5A + 5B CD

From the meaning of the title:
a+b=0
cd=1
X = 5 or - 5
When x = 5,
x+5a+5b-cd
=x+5（a+b）-cd
=5+5×0-1
=4
When x = 5,
x+5a+5b-cd
=x+5（a+b）-cd
=-5+5×0-1
=-6

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