2a+5a+9a = 16a
a= -0.8
a= -4
Collect like terms: 9a -7a = 9 - 15, ie 2a = -6, so a = -3
4a - 2.1 = 9a + 5.4 4a - 9a = 5.4 +2.1 -5a = 7.5 -a = 1.5 a = -1.5
2a+5a+9a = 16a
9a+21 3(3a+7)
12a + 6b + 9a + 14b =(12a + 9a) + (6b + 14b) =21a + 20b
a= -0.8
a is equal to 1.
a= -4
9a + 4a = 26 13a = 26 a = 26/13 a = 2
Collect like terms: 9a -7a = 9 - 15, ie 2a = -6, so a = -3
4a - 2.1 = 9a + 5.4 4a - 9a = 5.4 +2.1 -5a = 7.5 -a = 1.5 a = -1.5
a + 3a + 5a = 180 9a =180 a = 20
It is: 9a-a-a = 7a
a = 6b = 9a + b = 6 + 9 = 15