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.09t+.012(t+400)=216
We move all terms to the left:
.09t+.012(t+400)-(216)=0
We multiply parentheses
.09t+0.012t+4.8-216=0
We add all the numbers together, and all the variables
0.102t-211.2=0
We move all terms containing t to the left, all other terms to the right
0.102t=211.2
t=211.2/0.102
t=2070+0.060000000000002/0.102
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