Let's solve your equation step-by-step. 
−2(x+3)=(−10)(−2) 
Step 1: Simplify both sides of the equation. 
−2(x+3)=(−10)(−2) 
(−2)(x)+(−2)(3)=(−10)(−2)(Distribute) 
−2x+−6=20 
−2x−6=20 
Step 2: Add 6 to both sides. 
−2x−6+6=20+6 
−2x=26 
Step 3: Divide both sides by -2. 
−2x 
−2 
= 
26 
−2 
x=−13