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# Formulae / Changing the subject watch

1. (Original post by Bryz)
Ok, from now on I shall use brackets! That statement you made did make me chuckle though.

You've lost me..
(Original post by L'Evil Fish)

(3w+20)/20 = A/(A+12)

Make.a.common denominator? Or multiply throughout by 20(a+12)

What do you get?
You should have: (after multiplying through)

(3w+20)(A+12) = 20A

Expand. What do you get?
2. (Original post by L'Evil Fish)
You should have: (after multiplying through)

(3w+20)(A+12) = 20A

Expand. What do you get?
still unsure..didn't get any of it! been at it for ages!
3. (Original post by Bryz)
still unsure..didn't get any of it! been at it for ages!
Do you know how to expand brackets? If so, do that and post what you get.
4. (Original post by Mr M)
Do you know how to expand brackets? If so, do that and post what you get.
You just multiply them out? Multiply thr 1st bracket by the 2nd?
5. (Original post by Bryz)
You just multiply them out? Multiply thr 1st bracket by the 2nd?
Yes?

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