Question

solve for d.
19d - 16d - d - d - 1 = 12
d =

Explanation:

Step1: Combine like - terms on the left side

$(19d - 16d - d - d)-1 = 12$.
$19d-16d - d - d=(19 - 16-1 - 1)d=(3 - 1 - 1)d=d$.
So the equation becomes $d - 1=12$.

Step2: Isolate the variable d

Add 1 to both sides of the equation: $d-1 + 1=12 + 1$.
$d=13$.

Answer:

$13$