How do you solve $-21r = 63$ ?

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Answer 1 · 2017-07-28T03:37:27

Divide each side of the equation by $color(red)(-21)$ to solve for $r$ while keeping the equation balanced:

$(-21r)/color(red)(-21) = 63/color(red)(-21)$

$(color(red)(cancel(color(black)(-21)))r)/cancel(color(red)(-21)) = -3$

$r = -3$

Answer 2 · 2017-07-28T03:40:05

$r=-3$

Divide $-21$ from both sides:

$cancel(-21)/cancel(-21)r=63/(-21)$

$r=-63/21$

Simplify:

$r=-3$

How do you solve -21r = 63-21r = 63?