Answer :
8(10a - 4) + 5a = 5a - 12
8(10a) - 8(4) + 5a = 5a - 12
80a - 32 + 5a = 5a - 12
80a + 5a - 32 = 5a - 12
85a - 32 = 5a - 12
-5a -5a
80a - 32 = -12
+32 +32
80a = 20
80 80
a = 1/4
8(10a) - 8(4) + 5a = 5a - 12
80a - 32 + 5a = 5a - 12
80a + 5a - 32 = 5a - 12
85a - 32 = 5a - 12
-5a -5a
80a - 32 = -12
+32 +32
80a = 20
80 80
a = 1/4