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Simplifying -21 + 4x = -3(3x + 4) Reorder the terms: -21 + 4x = -3(4 + 3x) -21 + 4x = (4 * -3 + 3x * -3) -21 + 4x = (-12 + -9x) Solving -21 + 4x = -12 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. -21 + 4x + 9x = -12 + -9x + 9x Combine like terms: 4x + 9x = 13x -21 + 13x = -12 + -9x + 9x Combine like terms: -9x + 9x = 0 -21 + 13x = -12 + 0 -21 + 13x = -12 Add '21' to each side of the equation. -21 + 21 + 13x = -12 + 21 Combine like terms: -21 + 21 = 0 0 + 13x = -12 + 21 13x = -12 + 21 Combine like terms: -12 + 21 = 9 13x = 9 Divide each side by '13'. x = 0.6923076923 Simplifying x = 0.6923076923
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