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8×{72:[52-(188-a×12)]}+28=100​

Răspuns :

8 × { 72 : [ 52 - ( 188 - a × 12 ) ] } + 28 = 100

8 × { 72 : [ 52 - ( 188 - a × 12 ) ] } = 100 - 28

8 × { 72 : [ 52 - ( 188 - a × 12 ) ] } = 72

{ 72 : [ 52 - ( 188 - a × 12 ) ] } = 72 : 8

{ 72 : [ 52 - ( 188 - a × 12 ) ] } = 9

[ 52 - ( 188 - a × 12 ) ] = 72 : 9

[ 52 - ( 188 - a × 12 ) ] = 8

188 - a × 12 = 52 - 8

188 - a × 12 = 44

a × 12 = 188 - 44

a × 12 = 144

a = 144 : 12

a = 12