21(x-1)+9=9(x-1)+9

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Solution for 21(x-1)+9=9(x-1)+9 equation: 



21(x-1)+9=9(x-1)+9

We move all terms to the left:

21(x-1)+9-(9(x-1)+9)=0

We multiply parentheses

21x-(9(x-1)+9)-21+9=0



We calculate terms in parentheses: -(9(x-1)+9), so:

9(x-1)+9

We multiply parentheses

9x-9+9

We add all the numbers together, and all the variables

9x

Back to the equation:

-(9x)



We add all the numbers together, and all the variables

12x-12=0

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

12x=12

x=12/12

x=1

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