Answer :
A)
[tex]2x-3=15\\\\2x=18\quad|:2\\\\\boxed{x=9}\qquad\checkmark[/tex]
B)
[tex]81x-3=6 \\\\81x=9\quad|:81\\\\\boxed{x=\frac{1}{9}}[/tex]
C)
[tex]24-2x=13 \\\\-2x=-11\quad|:(-2)\\\\\boxed{x=\frac{11}{2}}[/tex]
D)
[tex]3x + 2 = 25 \\\\3x=23\quad|:3\\\\\boxed{x=\frac{23}{3}}[/tex]
E)
[tex]x^3+7=8 \\\\x^3=1\\\\\boxed{x=1}[/tex]
F)
[tex]4 + 5x = 18\\\\5x=14\quad|:5\\\\\boxed{x=\frac{14}{5}}[/tex]
Only answer A) is correct.
[tex]2x-3=15\\\\2x=18\quad|:2\\\\\boxed{x=9}\qquad\checkmark[/tex]
B)
[tex]81x-3=6 \\\\81x=9\quad|:81\\\\\boxed{x=\frac{1}{9}}[/tex]
C)
[tex]24-2x=13 \\\\-2x=-11\quad|:(-2)\\\\\boxed{x=\frac{11}{2}}[/tex]
D)
[tex]3x + 2 = 25 \\\\3x=23\quad|:3\\\\\boxed{x=\frac{23}{3}}[/tex]
E)
[tex]x^3+7=8 \\\\x^3=1\\\\\boxed{x=1}[/tex]
F)
[tex]4 + 5x = 18\\\\5x=14\quad|:5\\\\\boxed{x=\frac{14}{5}}[/tex]
Only answer A) is correct.