(2x^2+9x-1)+(3x^2+6x+18)-(5x^2-12)=

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Solution for (2x^2+9x-1)+(3x^2+6x+18)-(5x^2-12)= equation:


Simplifying
(2x2 + 9x + -1) + (3x2 + 6x + 18) + -1(5x2 + -12) = 0

Reorder the terms:
(-1 + 9x + 2x2) + (3x2 + 6x + 18) + -1(5x2 + -12) = 0

Remove parenthesis around (-1 + 9x + 2x2)
-1 + 9x + 2x2 + (3x2 + 6x + 18) + -1(5x2 + -12) = 0

Reorder the terms:
-1 + 9x + 2x2 + (18 + 6x + 3x2) + -1(5x2 + -12) = 0

Remove parenthesis around (18 + 6x + 3x2)
-1 + 9x + 2x2 + 18 + 6x + 3x2 + -1(5x2 + -12) = 0

Reorder the terms:
-1 + 9x + 2x2 + 18 + 6x + 3x2 + -1(-12 + 5x2) = 0
-1 + 9x + 2x2 + 18 + 6x + 3x2 + (-12 * -1 + 5x2 * -1) = 0
-1 + 9x + 2x2 + 18 + 6x + 3x2 + (12 + -5x2) = 0

Reorder the terms:
-1 + 18 + 12 + 9x + 6x + 2x2 + 3x2 + -5x2 = 0

Combine like terms: -1 + 18 = 17
17 + 12 + 9x + 6x + 2x2 + 3x2 + -5x2 = 0

Combine like terms: 17 + 12 = 29
29 + 9x + 6x + 2x2 + 3x2 + -5x2 = 0

Combine like terms: 9x + 6x = 15x
29 + 15x + 2x2 + 3x2 + -5x2 = 0

Combine like terms: 2x2 + 3x2 = 5x2
29 + 15x + 5x2 + -5x2 = 0

Combine like terms: 5x2 + -5x2 = 0
29 + 15x + 0 = 0
29 + 15x = 0

Solving
29 + 15x = 0

Solving for variable 'x'.

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

Add '-29' to each side of the equation.
29 + -29 + 15x = 0 + -29

Combine like terms: 29 + -29 = 0
0 + 15x = 0 + -29
15x = 0 + -29

Combine like terms: 0 + -29 = -29
15x = -29

Divide each side by '15'.
x = -1.933333333

Simplifying
x = -1.933333333

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