SAT Question 59afe8db: Linear Equations In One Variable answer and explanation with Desmos solution

Choice A is correct. Applying the distributive property on the left-hand side of the given equation yields $3x+5x+20=76$, or $8x+20=76$. Subtracting $20$ from each side of this equation yields $8x=56$. Dividing each side of this equation by $8$ yields $x=7$.