Question
514 x 13 + 712 x 13 + 514 x 13
= (a)            x 13
= (b)           
2 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

514 x 13 + 712 x 13 + 514 x 13
= (a)            x 13
= (b)