Answer:
it is -7
Explanation:
It is -7 because the answer ended up being a negative and 3×-7=-21
3x = -21 Equation
3x/3x = - 21/3x Divide the 3x by istself so it cancels out. and what you do to . one side you must do to the other so -21/3x
x = -7 Aswer to -21/3
