SOLUTION: 1. five times the sum of twice a number and 5 is the same as the sum of 9 times the number and 5. the unknown number is?

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Question 987628: 1. five times the sum of twice a number and 5 is the same as the sum of 9 times the number and 5.
the unknown number is?
Found 2 solutions by Edwin McCravy, ikleyn:
Answer by Edwin McCravy(20055)   (Show Source):
You can put this solution on YOUR website!
five times the sum of twice a number and 5 is the same as the sum of 9 times the number and 5.

Change "a number" and "the number" to N.

five times the sum of twice N and 5 is the same as the sum of 9 times N and 5.

Change "twice N" to 2N

five times the sum of 2N and 5 is the same as the sum of 9 times N and 5.

Change "9 times N" to 9N

five times the sum of 2N and 5 is the same as the sum of 9N and 5.

Change "the sum of 2N and 5" to (2N+5)

five times (2N+5) is the same as the sum of 9N and 5.

Change "the sum of 9N and 5" to 9N+5

five times (2N+5) is the same as 9N+5.

5(2N+5) is the same as 9N+5.

Change "is the same as" to an equal sign =.

5(2N+5) = 9N+5.

Now you can finish. Edwin

Answer by ikleyn(52781)   (Show Source):
You can put this solution on YOUR website!
.
The equation is

5*(2x + 5) = 9x + 5.

Solve it:

10x + 25 = 9x + 5,

10x - 9x = 5-25 = -20.

x = -20.

Check: The left side is 5*(2x + 5) = 5*(2*(-20) + 5) = 5*(-40 + 5) = 5*(-35) = -175.

             The right side is 9x + 5 = 9*(-20) + 5 = -180 + 5 = -175.