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0.7t+0.3(t-0.4)=1.57
We move all terms to the left:
0.7t+0.3(t-0.4)-(1.57)=0
We add all the numbers together, and all the variables
0.7t+0.3(t-0.4)-1.57=0
We multiply parentheses
0.7t+0.3t-0.12-1.57=0
We add all the numbers together, and all the variables
t-1.69=0
We move all terms containing t to the left, all other terms to the right
t=1.69
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