3x^2-3x^2+7x^2-9-4=

Solution for 3x^2-3x^2+7x^2-9-4= equation:

Simplifying
3x2 + -3x2 + 7x2 + -9 + -4 = 0

Reorder the terms:
-9 + -4 + 3x2 + -3x2 + 7x2 = 0

Combine like terms: -9 + -4 = -13
-13 + 3x2 + -3x2 + 7x2 = 0

Combine like terms: 3x2 + -3x2 = 0
-13 + 0 + 7x2 = 0
-13 + 7x2 = 0

Solving
-13 + 7x2 = 0

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '13' to each side of the equation.
-13 + 13 + 7x2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + 7x2 = 0 + 13
7x2 = 0 + 13

Combine like terms: 0 + 13 = 13
7x2 = 13

Divide each side by '7'.
x2 = 1.857142857

Simplifying
x2 = 1.857142857

Take the square root of each side:
x = {-1.362770288, 1.362770288}