(20+.15t)54=(30+.10t)65

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Solution for (20+.15t)54=(30+.10t)65 equation: 



(20+.15t)54=(30+.10t)65

We move all terms to the left:

(20+.15t)54-((30+.10t)65)=0

We add all the numbers together, and all the variables

(.15t+20)54-((.10t+30)65)=0

We multiply parentheses

54t-((.10t+30)65)+1080=0



We calculate terms in parentheses: -((.10t+30)65), so:

(.10t+30)65

We multiply parentheses

65t+1950

Back to the equation:

-(65t+1950)



We get rid of parentheses

54t-65t-1950+1080=0

We add all the numbers together, and all the variables

-11t-870=0

We move all terms containing t to the left, all other terms to the right

-11t=870

t=870/-11

t=-79+1/11

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