-6x + 3 ≥ 21
Subtract 3 from both sides.
-6x ≥ 21 - 3
Simplify.
-6x ≥ 18
Divide both sides by -6.
Remember, when dividing or multiplying by a negative number, you must switch the signs.
x ≤ 18 / -6
Simplify.
x ≤ -3
So, your answer is D) x ≤ -3
~Hope I helped!~