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5(t-9)+12.t=12
We move all terms to the left:
5(t-9)+12.t-(12)=0
We add all the numbers together, and all the variables
12.t+5(t-9)-12=0
We multiply parentheses
12.t+5t-45-12=0
We add all the numbers together, and all the variables
17t-57=0
We move all terms containing t to the left, all other terms to the right
17t=57
t=57/17
t=3+6/17
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