6+t is less than or equal to 13
if 6+t ≤13, then t ≤ 76 + t ≤ 13-6 -6t ≤ 7When subtracting 6 from positive 6 they cancel out leaving t. Then 13 - 6 = 7.
6 + tt could be 7 or less for that statement to be true
