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Simplifying -28 = 7x + 3(2x + 21) Reorder the terms: -28 = 7x + 3(21 + 2x) -28 = 7x + (21 * 3 + 2x * 3) -28 = 7x + (63 + 6x) Reorder the terms: -28 = 63 + 7x + 6x Combine like terms: 7x + 6x = 13x -28 = 63 + 13x Solving -28 = 63 + 13x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13x' to each side of the equation. -28 + -13x = 63 + 13x + -13x Combine like terms: 13x + -13x = 0 -28 + -13x = 63 + 0 -28 + -13x = 63 Add '28' to each side of the equation. -28 + 28 + -13x = 63 + 28 Combine like terms: -28 + 28 = 0 0 + -13x = 63 + 28 -13x = 63 + 28 Combine like terms: 63 + 28 = 91 -13x = 91 Divide each side by '-13'. x = -7 Simplifying x = -7
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