a + a + a - 2a = 3a - 2a = a
-4 + 2A = 12 - 15A + A-4 + 2A = 12 - 16A2A = 12 - 16A + 42A = 16 - 16AA = 8 - 8A
2a+5a+9a = 16a
a= (+a) or a= (-) b= 2a b= 2a c= (-a) c= (+a)
It is the expression 3 + 2a.
A equals 20.
1
2a + 3a + 4 = 5a + 4
12(8a + 28) + 2a + 5 84a + 336 + 2a + 5 86a + 341
A=2
a = 1
It is one linear equation in two unknown variables: e and a.