Question 627340
If 7 is added to twice a number and this sum is multiplied by 6, 
the result is the same as if the number is multiplied by 7 and 12
 is added to the product. Whats the number?
:
Let n = "a number"
:
6(2n + 7) = 7n + 12
12n + 42 = 7n + 12
12n - 7n = 12 - 42
5n = -30
n = {{{(-30)/5}}}
n = -6
:
:
Check
6(2(-6) + 7) = 7(-6) + 12
6(-12+7) = -42 + 12
6(-5) = -30