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31=x+1+2x+3x+2/3
31×3=x+1+2x+3x+2
93=6x+3
93-3=6x
90=6x
x=90÷6
=15
delin=2x
= 2×15
= 30
d = 2x
i = 3x+2
31 = {(x + 1) + 2x + (3x + 2)} / 3
31 = (6x + 3) / 3
31 x 3 = 6x + 3
93 = 6x + 3
90 = 6x
90/6 = x
15 = x
d = 2x
d = 2 (15)
d = 30 th