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To add 9 to both sides of -3x, we have:
-3x + 9 = 0
-3x + 9 = 0
-3x + 9 = 9
Starting with -3x = ?, we add 9 to both sides:
-3x + 9 = ? + 9
On the left side, -3x remains the same. On the right side, we add 9 to the unknown term.
Now, to determine the result on the right side, we need to know what the question mark represents. If there is an expression or value present on the right side of the equation, let's denote it as "y":
-3x + 9 = y
By adding 9 to both sides of -3x, we have successfully added 9 to both sides of the equation.