(3x^2+4x-5)+(5x^2+9x+18)-(8x^2-13)=

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Solution for (3x^2+4x-5)+(5x^2+9x+18)-(8x^2-13)= equation:


Simplifying
(3x2 + 4x + -5) + (5x2 + 9x + 18) + -1(8x2 + -13) = 0

Reorder the terms:
(-5 + 4x + 3x2) + (5x2 + 9x + 18) + -1(8x2 + -13) = 0

Remove parenthesis around (-5 + 4x + 3x2)
-5 + 4x + 3x2 + (5x2 + 9x + 18) + -1(8x2 + -13) = 0

Reorder the terms:
-5 + 4x + 3x2 + (18 + 9x + 5x2) + -1(8x2 + -13) = 0

Remove parenthesis around (18 + 9x + 5x2)
-5 + 4x + 3x2 + 18 + 9x + 5x2 + -1(8x2 + -13) = 0

Reorder the terms:
-5 + 4x + 3x2 + 18 + 9x + 5x2 + -1(-13 + 8x2) = 0
-5 + 4x + 3x2 + 18 + 9x + 5x2 + (-13 * -1 + 8x2 * -1) = 0
-5 + 4x + 3x2 + 18 + 9x + 5x2 + (13 + -8x2) = 0

Reorder the terms:
-5 + 18 + 13 + 4x + 9x + 3x2 + 5x2 + -8x2 = 0

Combine like terms: -5 + 18 = 13
13 + 13 + 4x + 9x + 3x2 + 5x2 + -8x2 = 0

Combine like terms: 13 + 13 = 26
26 + 4x + 9x + 3x2 + 5x2 + -8x2 = 0

Combine like terms: 4x + 9x = 13x
26 + 13x + 3x2 + 5x2 + -8x2 = 0

Combine like terms: 3x2 + 5x2 = 8x2
26 + 13x + 8x2 + -8x2 = 0

Combine like terms: 8x2 + -8x2 = 0
26 + 13x + 0 = 0
26 + 13x = 0

Solving
26 + 13x = 0

Solving for variable 'x'.

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

Add '-26' to each side of the equation.
26 + -26 + 13x = 0 + -26

Combine like terms: 26 + -26 = 0
0 + 13x = 0 + -26
13x = 0 + -26

Combine like terms: 0 + -26 = -26
13x = -26

Divide each side by '13'.
x = -2

Simplifying
x = -2

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