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0.8t+0.2(t-0.4)=-1.75
We move all terms to the left:
0.8t+0.2(t-0.4)-(-1.75)=0
We add all the numbers together, and all the variables
0.8t+0.2(t-0.4)+1.75=0
We multiply parentheses
0.8t+0.2t-0.08+1.75=0
We add all the numbers together, and all the variables
t+1.67=0
We move all terms containing t to the left, all other terms to the right
t=-1.67
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