Question

Solve the equation u-5=15 and state axiom that you use here

Answer 1

QUESTION ---- Solve the equation u-5=15 and state axiom that you use here

ANSWER
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u - 5 = 15

=> u = 15 + 5

=> u = 20

The Axiom used above is Transposition according to which when a number is shifted to the other side sign changes.
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Answer 2

hi,

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u - 5 = 15
u = 15 -5
u = 10

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When a number is sifted sifted then it's SIGN change