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Y=5
4 + y/5 = y
Multiply everything by 5
20 + y = 5y
- y -y
----------------- Subtract y
20 = 4y
--- --- Divide by 4
4 4
y= 5
3 + 5 = 4*b so 8 = 4*b Divide both sides by 4: 2 = b
12x = 4(x+5) 3x = x+5 divide by 4 2x = 5 subtract x x = 2.5 divide by 2
Evaluate -4(a+b) - 10a/b when a=8 and b=5
the answer to that is 5
So your problem is: 4x=5+5+5+5 OK, so u add all the 5's up: 4x=20 Then you divide 4 by 20: 4/20= 5 Therefore x= 5