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19t+18=-12+3t+18t
We move all terms to the left:
19t+18-(-12+3t+18t)=0
We add all the numbers together, and all the variables
19t-(21t-12)+18=0
We get rid of parentheses
19t-21t+12+18=0
We add all the numbers together, and all the variables
-2t+30=0
We move all terms containing t to the left, all other terms to the right
-2t=-30
t=-30/-2
t=+15
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