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-5t-2t-10t+15t=-18
We move all terms to the left:
-5t-2t-10t+15t-(-18)=0
We add all the numbers together, and all the variables
-2t+18=0
We move all terms containing t to the left, all other terms to the right
-2t=-18
t=-18/-2
t=+9
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