algebra
posted by mary on .
12x+10/5 =  x/20
I can't decide if I should cross multiply by 20 or just 20. The  is in the middle of the x and 20 (like a fraction)
I came up with 2 possible answers:
x=40/49 and x = 40/47

scroll down, I answered

The answer I got using a calc is 2

(12x+10)(20)/5 = x (20/20)
I made a sign error here
48 x 40 = +x
47 x = 40
x = 40/47 
Not for this problem

Is it (12x+10) / 5
Or
12x + (10/5)
? 
scroll down Matts. I did it both ways.

I am not a big fan of the expression "cross multiply"
What you want to do here is multiply both sides, all terms by 20 (or 20 would work too)
FIRST THE WAY YOU TYPED IT (probably wrong)
12(20) x + 2(20 ) = x(20)
240 x  40 = 20 x
220 x = 40
x = 2/11
NOW WHAT I THINK YOU MEAN
(12x+10)(20)/5 = x (20/20)
48 x 40 = x
49 x = 40
x = 40/49
PARENTHESES ARE IMPORTANT WHEN TYPING EQUATION ON A COMPUTER (because of order of operations)
typo  Damon, Friday, April 22, 2011 at 8:14pm
(12x+10)(20)/5 = x (20/20)
I made a sign error here
48 x 40 = +x
47 x = 40
x = 40/47