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The sum of three numbers is 78. The third number is 3 times the first. The second number is 7 less than the first. What are the numbers?

Respuesta :

Step-by-step explanation: Let the first number be x

x+3x+x-7=78

=4x+x-7=78

=5x-7=78

=5x= 78+7

=5x= 85

x=85/5

=17

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