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Simplifying -28 = 7(3x + 4) + 21x Reorder the terms: -28 = 7(4 + 3x) + 21x -28 = (4 * 7 + 3x * 7) + 21x -28 = (28 + 21x) + 21x Combine like terms: 21x + 21x = 42x -28 = 28 + 42x Solving -28 = 28 + 42x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42x' to each side of the equation. -28 + -42x = 28 + 42x + -42x Combine like terms: 42x + -42x = 0 -28 + -42x = 28 + 0 -28 + -42x = 28 Add '28' to each side of the equation. -28 + 28 + -42x = 28 + 28 Combine like terms: -28 + 28 = 0 0 + -42x = 28 + 28 -42x = 28 + 28 Combine like terms: 28 + 28 = 56 -42x = 56 Divide each side by '-42'. x = -1.333333333 Simplifying x = -1.333333333
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