Answer:
x = 5
Explanation:
20(20-x) = 300
20( -x + 20) = 300
-20x + 20 * 20 = 300
-20x = 300 - 400
x = -100 / -20
x=5
Divide each side by 20
20/20(20-x) = 300/20
20-x = 15
Subtract 20 from each side
20-x-20 = 15-20
-x = -5
Multiply each side by -1
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