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-10-3t=-2t
We move all terms to the left:
-10-3t-(-2t)=0
We get rid of parentheses
-3t+2t-10=0
We add all the numbers together, and all the variables
-1t-10=0
We move all terms containing t to the left, all other terms to the right
-t=10
t=10/-1
t=-10