3x^2-(x+3)(3x+3)=81

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Solution for 3x^2-(x+3)(3x+3)=81 equation:


Simplifying
3x2 + -1(x + 3)(3x + 3) = 81

Reorder the terms:
3x2 + -1(3 + x)(3x + 3) = 81

Reorder the terms:
3x2 + -1(3 + x)(3 + 3x) = 81

Multiply (3 + x) * (3 + 3x)
3x2 + -1(3(3 + 3x) + x(3 + 3x)) = 81
3x2 + -1((3 * 3 + 3x * 3) + x(3 + 3x)) = 81
3x2 + -1((9 + 9x) + x(3 + 3x)) = 81
3x2 + -1(9 + 9x + (3 * x + 3x * x)) = 81
3x2 + -1(9 + 9x + (3x + 3x2)) = 81

Combine like terms: 9x + 3x = 12x
3x2 + -1(9 + 12x + 3x2) = 81
3x2 + (9 * -1 + 12x * -1 + 3x2 * -1) = 81
3x2 + (-9 + -12x + -3x2) = 81

Reorder the terms:
-9 + -12x + 3x2 + -3x2 = 81

Combine like terms: 3x2 + -3x2 = 0
-9 + -12x + 0 = 81
-9 + -12x = 81

Solving
-9 + -12x = 81

Solving for variable 'x'.

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

Add '9' to each side of the equation.
-9 + 9 + -12x = 81 + 9

Combine like terms: -9 + 9 = 0
0 + -12x = 81 + 9
-12x = 81 + 9

Combine like terms: 81 + 9 = 90
-12x = 90

Divide each side by '-12'.
x = -7.5

Simplifying
x = -7.5

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