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0.15t+0.4=0.25
We move all terms to the left:
0.15t+0.4-(0.25)=0
We add all the numbers together, and all the variables
0.15t+0.15=0
We move all terms containing t to the left, all other terms to the right
0.15t=-0.15
t=-0.15/0.15
t=-1
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