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A)
5x + 8 - x - 3 = 2x + 17
5x - 2x - x = 17 - 8 + 3
5x - 3x = 20 - 8
2x = 12
x = 12/2
x = 6
B)
3( x - 1 ) + 7 = 2( x + 5 )
3x - 3 + 7 = 2x + 10
3x + 4 = 2x + 10
3x - 2x = 10 - 4
x = 6