solve for d.\n-16 + 7d - 4 = 6(d - 5) - 9\nd =

Explanation:

Step1: Simplify left - hand side

Combine like terms: $-16 - 4+7d=7d - 20$.

Step2: Expand right - hand side

Use the distributive property $a(b - c)=ab - ac$: $6(d - 5)-9=6d-30 - 9=6d - 39$.

Step3: Solve the equation

Set the simplified left - hand side equal to the simplified right - hand side: $7d - 20=6d - 39$. Subtract $6d$ from both sides: $7d-6d - 20=6d-6d - 39$, which gives $d - 20=-39$. Add 20 to both sides: $d-20 + 20=-39 + 20$.

Answer:

$d=-19$