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[12+3×(2×a+1)]=24va rog spuneti-mi cum se rezolva urgent​

Răspuns :

[ 12 + 3 × ( 2 × a + 1 ) ] = 24

3 × ( 2 × a + 1 ) = 24 - 12

3 × ( 2 × a + 1 ) = 12

2 × a + 1 = 12 : 3

2 × a + 1 = 4

2 × a = 4 - 1

2 × a = 3

a = 3 : 2

a = 1, 5 => numărul aflat