Exponential Equation

[josh.patinkin]

(15^x + 15^x+1) = 15^y4^y
[15^x + 15^x(15^1)] = 15^y4^y
(15^x )(1 + 15) = 15^y4^y
(15^x)(16) = 15^y4^y
(3^x)(5^x)(2^4) = (3^y)(5^y)(2^2y)


I have looked through tons of books, and I don't understand the steps taken above.

Particularly, how do we go from 15^x + 15^x(15^1) to 15^x(1+15).

[giteshr]

[StaceyKoprince]

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