What is the answer to 3x-x+7x+12=3x+9 ?

The answer to 3x-x+7x+12=3x+9 is x=-1/2

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3x-x+7x+12=3x+9

3 x - x + 7 x + 12 = 3 x + 9

x = - \frac{1}{2}

Solution steps

3 x - x + 7 x + 12 = 3 x + 9

Subtract

3 x

from both sides

3 x - x + 7 x + 12 - 3 x = 3 x + 9 - 3 x

Simplify

- x + 7 x + 12 = 9

Add similar elements:

- x + 7 x = 6 x

6 x + 12 = 9

Move

12

to the right side

6 x = - 3

Divide both sides by

6

x = - \frac{1}{2}

x^{2} - 2 x + 3 = 2 x^{2} - 4 x + 3

14 (t + 9) = 84

x^{2} - 1 < 2

12 x^{2} + 8 x

y^{2} + 6 y - 7 = 0