7x+8x=90.

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Solution for 7x+8x=90. equation: 



7x+8x=90.

We move all terms to the left:

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

We add all the numbers together, and all the variables

7x+8x-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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