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0.10t+0.11(t+4000)=1070
We move all terms to the left:
0.10t+0.11(t+4000)-(1070)=0
We multiply parentheses
0.10t+0.11t+440-1070=0
We add all the numbers together, and all the variables
0.21t-630=0
We move all terms containing t to the left, all other terms to the right
0.21t=630
t=630/0.21
t=3000
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