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$-3$ \,(r+ $6$ ) = $-63$

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Powers with negative bases

Full solution

Q.

-3

\,(r+

6

) =

-63

Distribute $-3$ : Distribute $-3$ to both terms inside the parentheses. $-3 \cdot r + -3 \cdot 6 = -63$ $-3r - 18 = -63$
Add $18$ : Add $18$ to both sides to isolate the term with $r$ . $\newline$ $-3r - 18 + 18 = -63 + 18$ $\newline$ $-3r = -45$
Divide by $-3$ : Divide both sides by $-3$ to solve for $r$ .
- $3r / -3 = -45 / -3$
$r = 15$

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