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Simplifying 28 = 7x + -7(2x + 4) Reorder the terms: 28 = 7x + -7(4 + 2x) 28 = 7x + (4 * -7 + 2x * -7) 28 = 7x + (-28 + -14x) Reorder the terms: 28 = -28 + 7x + -14x Combine like terms: 7x + -14x = -7x 28 = -28 + -7x Solving 28 = -28 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. 28 + 7x = -28 + -7x + 7x Combine like terms: -7x + 7x = 0 28 + 7x = -28 + 0 28 + 7x = -28 Add '-28' to each side of the equation. 28 + -28 + 7x = -28 + -28 Combine like terms: 28 + -28 = 0 0 + 7x = -28 + -28 7x = -28 + -28 Combine like terms: -28 + -28 = -56 7x = -56 Divide each side by '7'. x = -8 Simplifying x = -8
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