3x-1.2x=9
1.8x=9
x=5
8.8-4.4x=4.4
4.4x=4.4
x=1
2.25X4+0.3x=12
9+0.3x=12
0.3x=3
x=10
13x+5X13=169
13x+65=169
13x=104
x=8