Solve for t
t=\frac{4}{19}\approx 0.210526316
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-4+15t+4t=0
Add 4t to both sides.
-4+19t=0
Combine 15t and 4t to get 19t.
19t=4
Add 4 to both sides. Anything plus zero gives itself.
t=\frac{4}{19}
Divide both sides by 19.
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