6x-8+5x+21=90

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Solution for 6x-8+5x+21=90 equation: 



6x-8+5x+21=90

We move all terms to the left:

6x-8+5x+21-(90)=0

We add all the numbers together, and all the variables

11x-77=0

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

11x=77

x=77/11

x=7

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