{ [ 1545 : ( 201 - 2 × z ) + 95 ] × 3 - 18 } : 12 = 26
[ 1545 : ( 201 - 2 × z ) + 95 ] × 3- 18 = 26 × 12
[ 1545 : ( 201 - 2 × z ) + 95 ] × 3 - 18 = 312
[ 1545 : ( 201 - 2 × z ) + 95] × 3 = 312 + 18
[ 1545 : (201 -2 × z) + 95 ] × 3 = 330
1545 : ( 201 - 2 × z)+95 = 330 ÷ 3
1545 : ( 201 -2 × z )+95 = 110
1545 : ( 201 -2 × z ) = 110 - 95
1545 : ( 201 - 2 × z ) = 15
201 - 2 × z = 1545 : 15
201 - 2 × z = 103
2 × z= 201 - 103
2 × z= 98
z = 98 : 2
z=49