Question

Seven decreased by three times a number is forty,please help

Answer 1

7 - 3 = 4

4 x .... = 40

4 x 10 = 40

Answer 2

Hello, 

x= the number
3x= three times the number

seven decreased by three times a number is forty, then:

7-3x=40
-3x=33
x=-11

Answer: the number is -11