Răspuns:
{120- {200: (2 x a+1) + 204} : 4} x 3+ 7x9=240
{120- {200: (2 x a+1) + 204} : 4} x 3+ 63=240
{120- {200: (2 x a+1) + 204} : 4} x 3 = 240 - 63
{120- {200: (2 x a+1) + 204} : 4} x 3 = 177
{120- {200: (2 x a+1) + 204} : 4} = 177 : 3
120- {200: (2 x a+1) + 204} : 4 = 59
{200: (2 x a+1) + 204} : 4 = 120 - 59
{200: (2 x a+1) + 204} : 4 = 61
200: (2 x a+1) + 204 = 61 × 4
200: (2 x a+1) + 204 = 244
200: (2 x a+1) = 244 - 204
200: (2 x a+1) = 40
2 x a +1 = 200 : 40
2 × a + 1 = 5
2 × a = 5 - 1
2 × a = 4
a = 4 : 2
a = 2
