10 more than 6 times herald's age is the same as 4 times his age increased by 40 find harold age

Making an equation,

Let heralds age be x

10+6x=4x+40

Seperating constants and variables,

6x-4x=40-10

2x=30

x=30/2

=15

Heralds age is 15,

Substitute x with 15 in the equation for rechecking