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Simplifying -7(3x + 4) + 13 = 64 Reorder the terms: -7(4 + 3x) + 13 = 64 (4 * -7 + 3x * -7) + 13 = 64 (-28 + -21x) + 13 = 64 Reorder the terms: -28 + 13 + -21x = 64 Combine like terms: -28 + 13 = -15 -15 + -21x = 64 Solving -15 + -21x = 64 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + -21x = 64 + 15 Combine like terms: -15 + 15 = 0 0 + -21x = 64 + 15 -21x = 64 + 15 Combine like terms: 64 + 15 = 79 -21x = 79 Divide each side by '-21'. x = -3.761904762 Simplifying x = -3.761904762
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