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15=3.4t+1.6t
We move all terms to the left:
15-(3.4t+1.6t)=0
We add all the numbers together, and all the variables
-(+5t)+15=0
We get rid of parentheses
-5t+15=0
We move all terms containing t to the left, all other terms to the right
-5t=-15
t=-15/-5
t=+3
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