1/2x-28=50
1/2x=50+28
1/2x=78
x=78÷1/2
x=156
x-2/7x=15/28
5/7x=15/28
x=15/28÷5/7
x=3/4
3x-1.2=3.6
3x=3.6+1.2
3x=4.8
x=4.8÷3
x=1.6
x-20%x=7.2
0.8x=7.2
x=7.2÷0.8
x=9
0.9x+1.3x=5.28
2.2x=5.28
x=5.28÷2.2
x=2.4
1/2x-28=50
1/2x=50+28
1/2x=78
x=78÷1/2
x=156
x-2/7x=15/28
5/7x=15/28
x=15/28÷5/7
x=3/4
3x-1.2=3.6
3x=3.6+1.2
3x=4.8
x=4.8÷3
x=1.6
x-20%x=7.2
0.8x=7.2
x=7.2÷0.8
x=9
0.9x+1.3x=5.28
2.2x=5.28
x=5.28÷2.2
x=2.4