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10-10(t+9)=-30
We move all terms to the left:
10-10(t+9)-(-30)=0
We add all the numbers together, and all the variables
-10(t+9)+40=0
We multiply parentheses
-10t-90+40=0
We add all the numbers together, and all the variables
-10t-50=0
We move all terms containing t to the left, all other terms to the right
-10t=50
t=50/-10
t=-5
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