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Simplifying 126 = 7x + 7(2x + -15) Reorder the terms: 126 = 7x + 7(-15 + 2x) 126 = 7x + (-15 * 7 + 2x * 7) 126 = 7x + (-105 + 14x) Reorder the terms: 126 = -105 + 7x + 14x Combine like terms: 7x + 14x = 21x 126 = -105 + 21x Solving 126 = -105 + 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. 126 + -21x = -105 + 21x + -21x Combine like terms: 21x + -21x = 0 126 + -21x = -105 + 0 126 + -21x = -105 Add '-126' to each side of the equation. 126 + -126 + -21x = -105 + -126 Combine like terms: 126 + -126 = 0 0 + -21x = -105 + -126 -21x = -105 + -126 Combine like terms: -105 + -126 = -231 -21x = -231 Divide each side by '-21'. x = 11 Simplifying x = 11
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