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8x-3x= 7+9+12-5/2
5x= 28 -2 1/2
5x= 25 1/2
x= 25 ,5 /5
x= 5,1
8x - 12 + 5/2 - 3x - 9 = 7
8x - 3x = 7 + 12 - 5/2 + 9
5x = 28 - 5/2
5x = 56-5 /2
5x = 51/2
x = 25,5/5
x = 5,1