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-t/7.5=4
We move all terms to the left:
-t/7.5-(4)=0
We multiply all the terms by the denominator
-t-4*7.5=0
We add all the numbers together, and all the variables
-1t-30=0
We move all terms containing t to the left, all other terms to the right
-t=30
t=30/-1
t=-30
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