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-0.4(t+3)=9
We move all terms to the left:
-0.4(t+3)-(9)=0
We multiply parentheses
-0.4t-1.2-9=0
We add all the numbers together, and all the variables
-0.4t-10.2=0
We move all terms containing t to the left, all other terms to the right
-0.4t=10.2
t=10.2/-0.4
t=-25+0.2/0.4
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