6X+5X=18-7
11X=11
X=1
13X-5X=30-14
8X=16
X=2
10X+4X=10+8
14X=18
X=9/7
9x-7x=7+9
2x=16
x=8
5X+4X=16-6+3
9x=13
x=13/9
9x-3x=7-6+5
6x=6
x=1
3/6x-2/6x=1-1/3
1/6x=4/6
x=4
5/10X+2/10x=0.4+0.3
3/10x=0.7
x=7/3
5/6x-2/6x=4/3+2/3
3/6x=6/3
x=4
6x+7+5x=18
6x+5x+7=18
11x+7=18
11x=18-7
11x=11
x=1