Notez numarul cu ,,a"
( 2 × a + 5 ) × 4 - 4 = 32
( 2 × a + 5 ) × 4 = 32 + 4
2 × a + 5 = 36 : 4
2 × a + 5 = 9
2 × a = 9 - 5
2 × a = 4
a = 4 : 2
a = 2 → numarul , aflat prin metoda mersului invers
Verific:
( 2× 2 + 5 ) × 4 - 4 = 9 × 4 - 4 = 36 - 4 = 32