Question

Determine the unknown value in each equation Q= 7+9d=7d +3

Answer 1

d = - 2

Explanation:

given the equation

7 + 9d = 7d + 3

collect terms in d on the left side and numbers on the right side

subtract 7d from both sides

7 + 9d - 7d = 7d - 7d + 3 ( simplify both sides )

7 + 2d = 3 ( subtract 7 from both sides )

7 - 7 + 2d = 3 - 7 ( simplify both sides )

2d = - 4 ( divide both sides by 2 )

`(2)/(2)` d =
`(-4)/(2)` , that is

d = - 2