5 less than a number is equivalent to 1 more than three times the number.

The value of the unknown number is calculated as - 3

Let the unknown number = y

5  less than the number is written as = y - 5

1 more than three times the number is written as = 1 + 3y

Since the first statement and the second statement are equal, we can equate the two and solve for y.

y - 5 = 1 + 3y

collect similar terms together

y - 3y = 1 + 5

-2y = 6

y = -6/2

y = -3

Therefore, the number is - 3

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Building and solving the expression, it is found that the number is -3.

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They are equivalent, thus:

Solving for x.

The number is -3.

A similar problem is given at link

step-by-step explanation:

it's 15