Answer:
see below
Explanation:
2/5x - 1/4x = 3
Get a common denominator of 20
2/5x *4/4 - 1/4x *5/5 =3
8/20 x - 5/20x =3
3/20x = 3
Multiply by 20/3 to isolate x
20/3 * 3/20 x = 20/3 * 3
x = 20
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