31=4(x-8)-9

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Solution for 31=4(x-8)-9 equation: 



31=4(x-8)-9

We move all terms to the left:

31-(4(x-8)-9)=0



We calculate terms in parentheses: -(4(x-8)-9), so:

4(x-8)-9

We multiply parentheses

4x-32-9

We add all the numbers together, and all the variables

4x-41

Back to the equation:

-(4x-41)



We get rid of parentheses

-4x+41+31=0

We add all the numbers together, and all the variables

-4x+72=0

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

-4x=-72

x=-72/-4

x=+18

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