Solve For The Unknown

Solve for the unknown

1. x + 7 = 9

x = 9 - 7 = 2

2. 3x + 9 = 7

3x = 7 - 9

(1/3)(3x) = (-2)(1/3)

x = -2/3

3. x(x +3) + x + 9 = 7x + x + x(x - 2) + 4x

x^2 + 3x + x + 9 = 8x + x^2 - 2x + 4x

x^2 - x^2 + 4x + 9 = 10x

9 = 10x - 4x

(1/6)(9) = (6x)(1/6)

9/6 = x

3/2 = x

4. 4x/2 + x/3 = 9

$\frac{(3)4x}{(3)2} + \frac{x(2)}{3(2)} = 9$

12x/6 + 2x/6 = 9

(6/14)(14x/6) = (9)(6/14)

x = 27/7

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