It is an equation and the value of x is 4
It is an equation and the value of r is 66
It is an equation and the value of x works out as 88
13+13=26
15x26=390
It depends on the value of X If we assume that the value of X is 22, then 22 + 4 = 26
How about 20 plus 6 equals 26 as one example
x=26
8 + 3(6) = 8 + 18 = 26
26 + 8 = 34
n = 26
40