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Simplifying 4(x + 7) + -7x = 13 Reorder the terms: 4(7 + x) + -7x = 13 (7 * 4 + x * 4) + -7x = 13 (28 + 4x) + -7x = 13 Combine like terms: 4x + -7x = -3x 28 + -3x = 13 Solving 28 + -3x = 13 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + -3x = 13 + -28 Combine like terms: 28 + -28 = 0 0 + -3x = 13 + -28 -3x = 13 + -28 Combine like terms: 13 + -28 = -15 -3x = -15 Divide each side by '-3'. x = 5 Simplifying x = 5
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