K - 10/2 = -7
K - 5 = -7 (perform the indicated division)
K = -2 (add 5 to both sides of the equation)
_____
Perhaps you intended this.
(K -10)/2 = -7 (parentheses are used to identify the numerator)
K -10 = -14 (multiply both sides of the equation by 2
K = -4 (add 10 to both sides of the equation)
K - 5 = -7 (perform the indicated division)
K = -2 (add 5 to both sides of the equation)
_____
Perhaps you intended this.
(K -10)/2 = -7 (parentheses are used to identify the numerator)
K -10 = -14 (multiply both sides of the equation by 2
K = -4 (add 10 to both sides of the equation)