Like Terms
6a+4a
10a
3(a+6)
3a+18
x(x+4)
x2+4x
(4x3)(3x6)
12x9
3a+5x+7a+6c
10a+5x+6c
8a-4a
4a
8(c-2)
8c-16
a(a+8)+3
a2+11
7x7(3x2+4)
21x9+28x7
7x(6x+8)
42x2+56x
20c-10c+4c
14c
-3(a+5)+3
-3a-12
x3(x4+9)+7
x7+16x3
5x6(7x1+10)+15
35x7+65x6
15x3(9x4+11)
135x7+165x3