What is the first step when solving this equation? x−9=19

Answer 1

x-9=19

add 9 to both sides

it's an equality, so whatever you do to one side, do to the other side and the equality is still an equality

x-9+9 = 19+9

combine like terms

x +0 = 28

x = 28

check the answer

x-9=19

replace x with 28

28-9= 19

19=19