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Step 1: Subtract 12 from both sides of the equation to isolate the term 2x.
Step 2: Simplify the equation by subtracting 12 from both sides: 2x + 12 - 12 = 30 - 12. The equation becomes: 2x = 18.
Step 3: Divide both sides of the equation by 2 to solve for x: 2x/2 = 18/2. The equation becomes: x = 9.
Solution: The solution to the equation 2x + 12 = 30 is x = 9.