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**Algabre****Guest**

7x-1=20

Help me please, thanks

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 28,872

Hi Algabre,

7x-1=20.

7x=20+1.

7x=21.

x=3.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**bob bundy****Administrator**- Registered: 2010-06-20
- Posts: 8,594

hi Algabre

Welcome to the forum.

Here's a way that works for equations like these.

Draw function boxes to show what is happening to x, going left to right.

Then do the opposite starting with 20 and going right to left.

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Sometimes I deliberately make mistakes, just to test you! …………….Bob Bundy

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