Solve for t
t=1290
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2100+3t+7t=15000
Add 7t to both sides.
2100+10t=15000
Combine 3t and 7t to get 10t.
10t=15000-2100
Subtract 2100 from both sides.
10t=12900
Subtract 2100 from 15000 to get 12900.
t=\frac{12900}{10}
Divide both sides by 10.
t=1290
Divide 12900 by 10 to get 1290.
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