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If you add 15 to 3 times the mystery number you get 78 was the mystery number
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If you add 15 to 3 times the mystery number you get 78 was the mystery number

User Michael Blackburn
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so the equation looks like this : 15*3x=78
subtract 15 from both sides: -15 -15
then divide by 3 from both sides
to isolate the variable: 3x=63
3/3x=63/3
x=21 (your mystery number is 21)
User Artem Zelinskiy
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