Answer: D
Step-by-step explanation:
To see whuch equation has solution x=3. we can just plug x=3 into each equation to see which is correct. Let's actually solve each equation for practice.
A. Incorrect
5x+4=22 [subtract both sides by 4]
5x=18 [divide both sides by 5]
x=18/5
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B. Incorrect
6x+1=-19 [subtract both sides by 1]
6x=-20 [divide both sides by 6]
x=-20/6
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C. Incorrect
3x-2=34 [add both sides by 2]
3x=36 [divide both sides by 3]
x=12
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D. Correct
6x+6=24 [subtract both sides by 6]
6x=18 [divide both sides by 6]
x=3
Now, we know that D is correct.
