solve for r.\n-12 = 4(19 + r) - 20\nr =

Explanation:

Step1: Simplify the equation

$$ \begin{align*} -12&=4(19 + r)-20\ -12&=76+4r-20\ -12&=56 + 4r \end{align*} $$

Step2: Isolate the term with (r)

Subtract (56) from both sides: $$ \begin{align*} -12-56&=56 + 4r-56\ -68&=4r \end{align*} $$

Step3: Solve for (r)

Divide both sides by (4): $$ \begin{align*} r&=\frac{-68}{4}\ r&=-17 \end{align*} $$

Answer:

(r = -17)