The sum of a number and 5 is tripled then lessened by 15 to get 9

x = "a number"

:

Just write an expression for each phrase:

:

"sum of a number & 5 is tripled",

3 (x+5)

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"the result"

=

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"1 less than twice the number"

2x - 1

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Put is all together to form an equation and solve it:

3 (x+5) = 2x - 1

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3x + 15 = 2x - 1

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3x - 2x = - 1 - 15

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x = - 16

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Now in the original statement see if that is true

"the sum of a number and five is tripled, the result is one less than twice the number"

3 (-16+5) = 2 (-16) - 1

3 (-11) = - 32 - 1

-33 = - 33; equality confirms our solution of x = - 16

mark brainliest