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Simplifying 28 = 5x + -1(3x + 12) Reorder the terms: 28 = 5x + -1(12 + 3x) 28 = 5x + (12 * -1 + 3x * -1) 28 = 5x + (-12 + -3x) Reorder the terms: 28 = -12 + 5x + -3x Combine like terms: 5x + -3x = 2x 28 = -12 + 2x Solving 28 = -12 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 28 + -2x = -12 + 2x + -2x Combine like terms: 2x + -2x = 0 28 + -2x = -12 + 0 28 + -2x = -12 Add '-28' to each side of the equation. 28 + -28 + -2x = -12 + -28 Combine like terms: 28 + -28 = 0 0 + -2x = -12 + -28 -2x = -12 + -28 Combine like terms: -12 + -28 = -40 -2x = -40 Divide each side by '-2'. x = 20 Simplifying x = 20
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