Question 127394
You've started out just fine.
(0.80)x = x+5 Now you need to isolate the x, and it really doesn't matter which side of the equation it ends up on. Start by subtracting 5 from both sides.
0.8x-5 = x Now subtract 0.8x from both sides.
(0.8x-0.8x)-5 = (x-0.8x)
-5 = 0.2x Finally, divide both sides by 0.2
-5/0.2 = x, so...
x = -25
Check:
(0.80)x = x+5 Substitute x = -25
(0.8)(-25) = -25+5 Simplify.
-20 = -20 The solution works!