Question

47 – 7(x + 5) = 2^5.3

Answer 1

7^2x - 4.7⁵ = 7⁵.3

7^2x = 7⁵.3 + 4.7⁵

7^2x = 7⁵.(3 + 4)

7^2x = 7⁵.7

7^2x = 7⁶

2x = 6

x = 6 : 2

x = 4

Answer 2

47 – 7(x + 5) = 2^5.3
 47 - 7x - 35 = 32. 3
 12 - 7x = 96
 7x = -84
 x = -12

Answer 3

\(47-7\left(x+5\right)=2^5.3\)

\(47-7\left(x+5\right)=32.3\)

\(47-7\left(x+5\right)=96\)

\(-7\left(x+5\right)=47-96\)

\(-7\left(x+5\right)=-49\)

\(x+5=\left(-49\right):\left(-7\right)\)

\(x+5=7\)

\(x=7-5\)

\(x=2\)

Vậy \(x=2\)