6 + z = 10 whats the value of z

Subtract 6 from both sides : z = 16

There's your answer : z = 16

Collect like terms by changing the sign when you move the term to the other side.

z = 10 - 6 (change sign)

z = 4

Note: Changing the sign is a shortcut precise method is to add/subtract a term on both sides to cancel out the term you don't want

Method: 6 - 6 + z = 10 - 6

(subtract - 6 to cancel out the 6)

Therfore: z = 10 - 6. - --> z = 4