**What so good in doing "A Pair at 1 Time"?**

1. You can turn 'don't know' to 'know'.

2. Carelessness is avoided.

3. Not matter how long the equation is, it will always a short equation.

4. Always feel easy.

How You solve [2(x+5y) - 3(x-y)] - 7[3x - (x+6y)]?

**Please observe every steps!**

[2(x+5y) - 3(x-y)] - 7[3x - (x+6y)]

=[2x+10y - 3(x-y)] - 7[3x - (x+6y)]

=[2x+10y - 3x+3y] - 7[3x - (x+6y)]

=[2x+10y - 3x+3y] - 7[3x - x - 6y]

=[2x+10y - 3x+3y] - 7[3x - x - 6y]

=[2x - 3x + 10y +3y] - 7[2x -6y]

=[-x+13y] - 14x + 42y

= -x - 14x + 13y + 42y

= -15x + 55y

**Try!**

1) 26 + 45 + 37

2) 63 / 7 x 18 / 3 x 5

3) [(85-49) / 4] x 21

4) x/2 + (x-3)/3 - (x-4)/4

5) x = (x+8)/4

6) Arrange the following numbers in ascending order:

3/7, 7/9 , 0.789, 7/11, 1/3

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