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(a - 36) + b = 81 - 36
(a - 36) + b = 45
* 2(45) = 3 {45 - (a-36)}
90 = 135 - 3(a - 36)
45 = 3a - 108
3a = 153
a = 51
----> si a = 51
a + b = 81
51 + b = 81
b = 30