9x+3+7x+15=90

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Solution for 9x+3+7x+15=90 equation: 



9x+3+7x+15=90

We move all terms to the left:

9x+3+7x+15-(90)=0

We add all the numbers together, and all the variables

16x-72=0

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

16x=72

x=72/16

x=4+1/2

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