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[(9×z+12356÷4)÷2-307]÷10÷5-2×5=17

[(9×z+12356÷4)÷2-307]÷10÷5-2×5=17

[(9×z+12356÷4)÷2-307]÷10÷5-10=17

[(9×z+12356÷4)÷2-307]÷10÷5=27

[(9×z+12356÷4)÷2-307]÷10=135

(9×z+12356÷4)÷2-307=1350

(9×z+12356÷4)÷2=1657

9×z+12356÷4=3314

9z+12356:4=3314

9z+3089=3314

9z=225

z=225/9

z=25

Răspuns:

Explicație pas cu pas:

[( 9*z+3089 )/2-307]/10/5-10= 17

[(9*z+3089)/2-307] /10 /5=17+10

[(9*z+3089)/2-307] /10 /5=27

[(9*z+3089)/2-307] /10=27*5

[(9*z+3089)/2-307] /10=135

(9*z+3089)/2-307=135*10

(9*z+3089)/2-307=1350

(9*z+3089)/2=1350+307

(9*z+3089)/2=1657

9*z+3089=1657*2

9*z+3089=3314

9*z= 3314-3089

9*z= 225

z=225*9

z=25