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Simplifying 13 + 7(-3x + -1) = -63 Reorder the terms: 13 + 7(-1 + -3x) = -63 13 + (-1 * 7 + -3x * 7) = -63 13 + (-7 + -21x) = -63 Combine like terms: 13 + -7 = 6 6 + -21x = -63 Solving 6 + -21x = -63 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + -21x = -63 + -6 Combine like terms: 6 + -6 = 0 0 + -21x = -63 + -6 -21x = -63 + -6 Combine like terms: -63 + -6 = -69 -21x = -69 Divide each side by '-21'. x = 3.285714286 Simplifying x = 3.285714286
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