So you start by adding 8t+5t which equals 13t. So 13t=220. Now you divide by 13 so t=220/13
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That's entirely correct.If you divide each side of the equation by 't',you reach the startling conclusion that 5 = 5 !
t=-2
15t = 17 + 8t -24 15t - 8t = 17 - 24 7t = -7 t = -1
-8t = -152 t = 19