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x = 8/2
x =4
2+x=8
x = 8-2
x = 6
×+×+×+×=8
4x= 8
x = 8/4
x = 2
2+3x=8
3x = 8-2
3x = 6
x = 6/3
x = 2
3x-5=16
3x = 16+5
3x = 21
x = 21/3
x = 7
31x-57=15
31x = 15+57
31x = 72
x = 72/31