Question

Afla valoarea lui a : [a+(14:7)x8]x9-[15:5x2+(147:3)]x5=103

Answer 1

[a+(14:7)×8]×9-[15:5×2+(147:3)]×5=103
(a+2×8)×9-(3×2+49)×5=103
(a+16)×9-(6+49)×5=103
9a+144-55×5=103
9a+144-275=103
9a=103-144+275
9a=-41+275
9a=234
a=234:9
a=26

Answer 2

 [a + (14 : 7 ) x 8 ] x 9 - [15 : 5 x 2 + (147 : 3 ) ] x 5 = 103
( a + 2 x 8 )x 9 - ( 6 + 49) x 5 = 103 
( a + 16 ) x 9 - 55 x 5 = 103 
( a + 16 ) x 9 - 275 = 103 
( a + 16 ) x 9 = 103 + 275 
( a + 16 ) x 9 = 378 
a + 16 = 378 : 9 
a + 16 = 42
a = 42 - 16 
a = 26