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Simplifying 3x^{2}+ 3x = 18 Reorder the terms: 3x + 3x^{2}= 18 Solving 3x + 3x^{2}= 18 Solving for variable 'x'. Reorder the terms: -18 + 3x + 3x^{2}= 18 + -18 Combine like terms: 18 + -18 = 0 -18 + 3x + 3x^{2}= 0 Factor out the Greatest Common Factor (GCF), '3'. 3(-6 + x + x^{2}) = 0 Factor a trinomial. 3((-3 + -1x)(2 + -1x)) = 0 Ignore the factor 3.## Subproblem 1

Set the factor '(-3 + -1x)' equal to zero and attempt to solve: Simplifying -3 + -1x = 0 Solving -3 + -1x = 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 + -1x = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -1x = 0 + 3 -1x = 0 + 3 Combine like terms: 0 + 3 = 3 -1x = 3 Divide each side by '-1'. x = -3 Simplifying x = -3## Subproblem 2

Set the factor '(2 + -1x)' equal to zero and attempt to solve: Simplifying 2 + -1x = 0 Solving 2 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -1x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1x = 0 + -2 -1x = 0 + -2 Combine like terms: 0 + -2 = -2 -1x = -2 Divide each side by '-1'. x = 2 Simplifying x = 2## Solution

x = {-3, 2}

| 3x^2-7x+2=0 | | 2x^2+8x-11=0 | | x^4+2*x^3+5*x+3=0 | | 3X^2+4=16 | | 3x^2=12 | | 4x^2=11 | | 7x^8+3x^4-10=0 | | 7x^8+3x^4+10=0 | | 7x^4=-7 | | 4x^2+28=0 | | 2x^2=14 | | x^2+13=20 | | 5x^4=16 | | 9x^5=3 | | x^2+4=8 |

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