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## Homework Statement

[/B]

Solve without external aids. You may use memorized 2nd degree equation formula.

9(x-2)= 3x(x-2)

## Homework Equations

3. The Attempt at a Solution [/B]

Use memorized 2nd degree equation formula

9x-18= 3x^2 -6x ]]] + 18

9x= 3x^2 -6x +18 ]]] -9x

0 = 3x

^{2}-15x + 18

After some tiresome calculation with pen-and-paper

I reached conclusion that

x is either

(15+3) /6 = 3

or

(15-3) / 6 = 2

x either 2 or 3

I wonder if there is an easier way to solve the equation with only mental arithmetic of course... (no calculator no formula sheet)