-243=-9(10+r)

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Solution for -243=-9(10+r) equation: 



-243=-9(10+r)

We move all terms to the left:

-243-(-9(10+r))=0

We add all the numbers together, and all the variables

-(-9(r+10))-243=0



We calculate terms in parentheses: -(-9(r+10)), so:

-9(r+10)

We multiply parentheses

-9r-90

Back to the equation:

-(-9r-90)



We get rid of parentheses

9r+90-243=0

We add all the numbers together, and all the variables

9r-153=0

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

9r=153

r=153/9

r=17

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