Solving for two unknown variables (s and t) requires two independent equations. You have only one.
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t=-2
15t = 17 + 8t -24 15t - 8t = 17 - 24 7t = -7 t = -1
-8t = -152 t = 19
8t + 5 = 6t + 1,subtract 6t an 5 from each side,2t = -4t = -2Checking, 8t + 5 = -16 + 5 = -11 and 6t +1 = -12 + 1 = -11
So you start by adding 8t+5t which equals 13t. So 13t=220. Now you divide by 13 so t=220/13 Hope I helped!