(2/7)^-3*(2/7)^-11=(2/7)^7x
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Step-by-step explanation
2/7^-3 * 2/7^-11 = 2/7^7x
(a^m * a^n = a^m+n)
⇒2/7 ^ -3-11= 2/7^7x
⇒2/7^-14 = 2/7^7x
⇒7x = -14
⇒x = -14/7
= -2
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