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Simplifying 28 = 4x + 8(x + -7) Reorder the terms: 28 = 4x + 8(-7 + x) 28 = 4x + (-7 * 8 + x * 8) 28 = 4x + (-56 + 8x) Reorder the terms: 28 = -56 + 4x + 8x Combine like terms: 4x + 8x = 12x 28 = -56 + 12x Solving 28 = -56 + 12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12x' to each side of the equation. 28 + -12x = -56 + 12x + -12x Combine like terms: 12x + -12x = 0 28 + -12x = -56 + 0 28 + -12x = -56 Add '-28' to each side of the equation. 28 + -28 + -12x = -56 + -28 Combine like terms: 28 + -28 = 0 0 + -12x = -56 + -28 -12x = -56 + -28 Combine like terms: -56 + -28 = -84 -12x = -84 Divide each side by '-12'. x = 7 Simplifying x = 7
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