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Simplifying 13x + 7(3x + -1) = -63 Reorder the terms: 13x + 7(-1 + 3x) = -63 13x + (-1 * 7 + 3x * 7) = -63 13x + (-7 + 21x) = -63 Reorder the terms: -7 + 13x + 21x = -63 Combine like terms: 13x + 21x = 34x -7 + 34x = -63 Solving -7 + 34x = -63 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 34x = -63 + 7 Combine like terms: -7 + 7 = 0 0 + 34x = -63 + 7 34x = -63 + 7 Combine like terms: -63 + 7 = -56 34x = -56 Divide each side by '34'. x = -1.647058824 Simplifying x = -1.647058824
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