64x^2-(3-8x^2)=87

Solution for 64x^2-(3-8x^2)=87 equation:

Simplifying
64x2 + -1(3 + -8x2) = 87
64x2 + (3 * -1 + -8x2 * -1) = 87
64x2 + (-3 + 8x2) = 87

Reorder the terms:
-3 + 64x2 + 8x2 = 87

Combine like terms: 64x2 + 8x2 = 72x2
-3 + 72x2 = 87

Solving
-3 + 72x2 = 87

Solving for variable 'x'.

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

Add '3' to each side of the equation.
-3 + 3 + 72x2 = 87 + 3

Combine like terms: -3 + 3 = 0
0 + 72x2 = 87 + 3
72x2 = 87 + 3

Combine like terms: 87 + 3 = 90
72x2 = 90

Divide each side by '72'.
x2 = 1.25

Simplifying
x2 = 1.25

Take the square root of each side:
x = {-1.118033989, 1.118033989}