SOLUTION: What number subtracted from 78 equals 60

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Question 921510: What number subtracted from 78 equals 60
Answer by MathLover1(20855) About Me  (Show Source):
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let a number be x
given:
x subtracted from 78 equals 60:
78-x=60 ...........solve for x
78-x%2Bx=60%2Bx
78=60%2Bx
78-60=60-60%2Bx
78-60=x
18=x