7x-7+8x-8=90

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



7x-7+8x-8=90

We move all terms to the left:

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

We add all the numbers together, and all the variables

15x-105=0

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

15x=105

x=105/15

x=7

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