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Simplifying -105 = 7x + 7(2x + 3) Reorder the terms: -105 = 7x + 7(3 + 2x) -105 = 7x + (3 * 7 + 2x * 7) -105 = 7x + (21 + 14x) Reorder the terms: -105 = 21 + 7x + 14x Combine like terms: 7x + 14x = 21x -105 = 21 + 21x Solving -105 = 21 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. -105 + -21x = 21 + 21x + -21x Combine like terms: 21x + -21x = 0 -105 + -21x = 21 + 0 -105 + -21x = 21 Add '105' to each side of the equation. -105 + 105 + -21x = 21 + 105 Combine like terms: -105 + 105 = 0 0 + -21x = 21 + 105 -21x = 21 + 105 Combine like terms: 21 + 105 = 126 -21x = 126 Divide each side by '-21'. x = -6 Simplifying x = -6
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