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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 = -8x -7 + -8x = -63 Solving -7 + -8x = -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 + -8x = -63 + 7 Combine like terms: -7 + 7 = 0 0 + -8x = -63 + 7 -8x = -63 + 7 Combine like terms: -63 + 7 = -56 -8x = -56 Divide each side by '-8'. x = 7 Simplifying x = 7
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