(7x+6)+(8x-6)=90

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Solution for (7x+6)+(8x-6)=90 equation: 



(7x+6)+(8x-6)=90

We move all terms to the left:

(7x+6)+(8x-6)-(90)=0

We get rid of parentheses

7x+8x+6-6-90=0

We add all the numbers together, and all the variables

15x-90=0

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

15x=90

x=90/15

x=6

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