(5+8x)+21=90

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Solution for (5+8x)+21=90 equation: 



(5+8x)+21=90

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

(8x+5)-69=0

We get rid of parentheses

8x+5-69=0

We add all the numbers together, and all the variables

8x-64=0

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

8x=64

x=64/8

x=8

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