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0.2t+0.4(15-t)=5
We move all terms to the left:
0.2t+0.4(15-t)-(5)=0
We add all the numbers together, and all the variables
0.2t+0.4(-1t+15)-5=0
We multiply parentheses
0.2t-0.4t+6-5=0
We add all the numbers together, and all the variables
-0.2t+1=0
We move all terms containing t to the left, all other terms to the right
-0.2t=-1
t=-1/-0.2
t=+5
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