ANSWER
x=-5 or just -5
STEP BY STEP EXPLANATION
ok, so the equation is -20=5(x+1), so first you do the distributive property and your new equation should be -20=5x+5
Then you subtract 5 from both sides and your new equation should be -25=5x
Then you divide 5 from both sides and your final answer should be x=-5 or -5
CHECH YOUR WORK
To check your work just plug in -5 into the equation, so -20=5(-5+1)
-20=5(-4) and the final equation is -20=-20. So the answer of -5 is correct
hope this helped!