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3a=81/3
a=27
1:27 2:28 3:29
x+1
x+2
3x + 3 = 84
3x = 81/3
x= 27
x+1 = 28
x+2 = 29
3x+3=84 I-3
3x=84-3
3x=81
x=27
x+1=28
x+2=29