Answer:
x=3
Explanation:
40x + 120 = 20x + 180
(40x - 20) + 120 = (20x- 20) + 180
= 20x + 120 = 180
20x + (120-120) = 180 - 120
20x = 60
divide 20 to both sides of 20 and 60 so you will get x=3
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