(6t+6)+(7t-7)=90

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Solution for (6t+6)+(7t-7)=90 equation: 



(6t+6)+(7t-7)=90

We move all terms to the left:

(6t+6)+(7t-7)-(90)=0

We get rid of parentheses

6t+7t+6-7-90=0

We add all the numbers together, and all the variables

13t-91=0

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

13t=91

t=91/13

t=7

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