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Simplifying 3x(x + 1) + -7x(x + 2) = 6 Reorder the terms: 3x(1 + x) + -7x(x + 2) = 6 (1 * 3x + x * 3x) + -7x(x + 2) = 6 (3x + 3x2) + -7x(x + 2) = 6 Reorder the terms: 3x + 3x2 + -7x(2 + x) = 6 3x + 3x2 + (2 * -7x + x * -7x) = 6 3x + 3x2 + (-14x + -7x2) = 6 Reorder the terms: 3x + -14x + 3x2 + -7x2 = 6 Combine like terms: 3x + -14x = -11x -11x + 3x2 + -7x2 = 6 Combine like terms: 3x2 + -7x2 = -4x2 -11x + -4x2 = 6 Solving -11x + -4x2 = 6 Solving for variable 'x'. Reorder the terms: -6 + -11x + -4x2 = 6 + -6 Combine like terms: 6 + -6 = 0 -6 + -11x + -4x2 = 0 Factor out the Greatest Common Factor (GCF), '-1'. -1(6 + 11x + 4x2) = 0 Factor a trinomial. -1((2 + x)(3 + 4x)) = 0 Ignore the factor -1.Subproblem 1
Set the factor '(2 + x)' equal to zero and attempt to solve: Simplifying 2 + x = 0 Solving 2 + x = 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 + x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + x = 0 + -2 x = 0 + -2 Combine like terms: 0 + -2 = -2 x = -2 Simplifying x = -2Subproblem 2
Set the factor '(3 + 4x)' equal to zero and attempt to solve: Simplifying 3 + 4x = 0 Solving 3 + 4x = 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 + 4x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + 4x = 0 + -3 4x = 0 + -3 Combine like terms: 0 + -3 = -3 4x = -3 Divide each side by '4'. x = -0.75 Simplifying x = -0.75Solution
x = {-2, -0.75}
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