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Simplifying 4x + 7(3 + 3x) + -9 = -13 4x + (3 * 7 + 3x * 7) + -9 = -13 4x + (21 + 21x) + -9 = -13 Reorder the terms: 21 + -9 + 4x + 21x = -13 Combine like terms: 21 + -9 = 12 12 + 4x + 21x = -13 Combine like terms: 4x + 21x = 25x 12 + 25x = -13 Solving 12 + 25x = -13 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 25x = -13 + -12 Combine like terms: 12 + -12 = 0 0 + 25x = -13 + -12 25x = -13 + -12 Combine like terms: -13 + -12 = -25 25x = -25 Divide each side by '25'. x = -1 Simplifying x = -1
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