Explanation:
1.) 23=x+8
15 = x
x = 15
2.) 28=3x+1
27 = 3x
3x = 27
x = 9
3.) 53=8x+5
48 = 8x
8x = 48
x = 6
4.) 13=11+4x
2 = 4x
4x = 2
x = 2/4
x = 1/2
5.) 7=8x+3
4 = 8x
8x = 4
x = 8/4
6.) 12=7+15x
5 = 15x
1 = 3x
3x = 1
x = 1/3
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