Question

the product of a number y and -6 equal to the sum of the same number y and 21

Answer 1

y×-6 =y+21 , -6y=y+21 , -7y=21 , y= -3

Answer 2

y×(-6) = y+21
-6y = y+21
-6y-y = 21
-7y = 21
y = 21÷(-7)
y = -3