Question

6 times the sum of a number and 7 is 18

Answer 1

6(x+7)=18
6x+42=18
6x=-24
x=-4

Answer 2

The simplest way to find this number is to add your two known values (7 and 6) which should be 13. Now you should subtract it from 18. (18-13). That should equal to 5, which is your answer.