18+t=0.90(30+t)

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Solution for 18+t=0.90(30+t) equation: 



18+t=0.90(30+t)

We move all terms to the left:

18+t-(0.90(30+t))=0

We add all the numbers together, and all the variables

t-(0.90(t+30))+18=0



We calculate terms in parentheses: -(0.90(t+30)), so:

0.90(t+30)

We multiply parentheses

0.9t+27

Back to the equation:

-(0.9t+27)



We get rid of parentheses

t-0.9t-27+18=0

We add all the numbers together, and all the variables

0.1t-9=0

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

0.1t=9

t=9/0.1

t=90

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