Question

Sa se determine a din egalitatea 20:{[a+(5+3*7)]:(a+2)}+1=6

Answer 1

20:{[a+(5+3*7)]:(a+2)}+1=6

20:{[a+(5+3*7)]:(a+2)} = 5

20:(a+26):(a+2) = 5

(a+26):(a+2) = 20:5 = 4

a + 26 = 4 x (a + 2)

a + 26= 4a + 8

26-8 = 3a

a=6