Solve for t
t=18
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90+15t=20t
Use the distributive property to multiply 15 by 6+t.
90+15t-20t=0
Subtract 20t from both sides.
90-5t=0
Combine 15t and -20t to get -5t.
-5t=-90
Subtract 90 from both sides. Anything subtracted from zero gives its negation.
t=\frac{-90}{-5}
Divide both sides by -5.
t=18
Divide -90 by -5 to get 18.
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