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Step 1: Subtract 15 from both sides of the inequality: 9x + 15 - 15 ≥ 51 - 15
Step 2: Simplify: 9x ≥ 36
Step 3: Divide both sides of the inequality by 9: 9x/9 ≥ 36/9
Step 4: Simplify: x ≥ 4