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$\dfrac{a}{a}=1$

Theory

aa=1\dfrac{a}{a}=1

Any non-zero number or expression divided by itself is equal to 1.1. 4545=12x+52x+5=1 \dfrac{45}{45}=1 \qquad \dfrac{2x+5}{2x+5}=1 This is true for all values of the variables except the one(s) that makes the denominator 0.0.