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(a+112-30)/2x6-300=6

Răspuns :

(a+112-30)/2×6-300=6

(a+82)/2×6-300=6

(a+82)/2×6=6+300=306

(a+82)/2=306/6=51

a+82=51×2=102

a=102-82=20

( a+112-30):2×6-300=6

a+82:2×6=6+300

a+82:2×6=306

a+82:2=306:6

a+82:2=51

a+82=51×2

a+82=102

a=102-82

a=20