(-7)-7s=(-9s)+7

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Solution for (-7)-7s=(-9s)+7 equation: 



(-7)-7s=(-9s)+7

We move all terms to the left:

(-7)-7s-((-9s)+7)=0

We add all the numbers together, and all the variables

-7s-((-9s)+7)-7=0



We calculate terms in parentheses: -((-9s)+7), so:

(-9s)+7

We get rid of parentheses

-9s+7

Back to the equation:

-(-9s+7)



We get rid of parentheses

-7s+9s-7-7=0

We add all the numbers together, and all the variables

2s-14=0

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

2s=14

s=14/2

s=7

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