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5(t-9)+12.t=20
We move all terms to the left:
5(t-9)+12.t-(20)=0
We add all the numbers together, and all the variables
12.t+5(t-9)-20=0
We multiply parentheses
12.t+5t-45-20=0
We add all the numbers together, and all the variables
17t-65=0
We move all terms containing t to the left, all other terms to the right
17t=65
t=65/17
t=3+14/17
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