Question

{54 - 144 : [ 5 * ( 7 * a ) - 34 ] : 2} : 13 = 4

Answer 1

{54-144:[5x(7xa)-34]:2}=4x13
{54-144:[5x(7xa)-34]:2}=52
144:[5x(7xa)-34]:2=54-52
144:[5x(7xa)-34]:2=2
144:[5x(7xa)-34]=2x2
144:[5x(7xa)-34]=4
[5x(7xa)-34]=144:4
[5x(7xa)-34]=36
5x(7xa)=36+34
5x(7xa)=70
(7xa0=70:5
7xa=14
a=14:7
a=2