Question 234249
Find a number which is decreased by 18 is 5 times its opposite. 
:
An opposite is the same number with an opposite sign
:
x - 18 = 5(-x)
x - 18 = -5x
x + 5x = + 18
6x = 18
x = 3
;
;
See if this is true
3 - 18 = 5(-3)