(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

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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