15-x=2x(x+3)

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Solution for 15-x=2x(x+3) equation:


Simplifying
15 + -1x = 2x(x + 3)

Reorder the terms:
15 + -1x = 2x(3 + x)
15 + -1x = (3 * 2x + x * 2x)
15 + -1x = (6x + 2x2)

Solving
15 + -1x = 6x + 2x2

Solving for variable 'x'.

Combine like terms: -1x + -6x = -7x
15 + -7x + -2x2 = 6x + 2x2 + -6x + -2x2

Reorder the terms:
15 + -7x + -2x2 = 6x + -6x + 2x2 + -2x2

Combine like terms: 6x + -6x = 0
15 + -7x + -2x2 = 0 + 2x2 + -2x2
15 + -7x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
15 + -7x + -2x2 = 0

Factor a trinomial.
(3 + -2x)(5 + x) = 0

Subproblem 1

Set the factor '(3 + -2x)' equal to zero and attempt to solve: Simplifying 3 + -2x = 0 Solving 3 + -2x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -2x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -2x = 0 + -3 -2x = 0 + -3 Combine like terms: 0 + -3 = -3 -2x = -3 Divide each side by '-2'. x = 1.5 Simplifying x = 1.5

Subproblem 2

Set the factor '(5 + x)' equal to zero and attempt to solve: Simplifying 5 + x = 0 Solving 5 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + x = 0 + -5 x = 0 + -5 Combine like terms: 0 + -5 = -5 x = -5 Simplifying x = -5

Solution

x = {1.5, -5}

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