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-10t-5t+20t-7t=-20
We move all terms to the left:
-10t-5t+20t-7t-(-20)=0
We add all the numbers together, and all the variables
-2t+20=0
We move all terms containing t to the left, all other terms to the right
-2t=-20
t=-20/-2
t=+10
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