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Simplifying 126 = 3x + 3(4x + 7) Reorder the terms: 126 = 3x + 3(7 + 4x) 126 = 3x + (7 * 3 + 4x * 3) 126 = 3x + (21 + 12x) Reorder the terms: 126 = 21 + 3x + 12x Combine like terms: 3x + 12x = 15x 126 = 21 + 15x Solving 126 = 21 + 15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15x' to each side of the equation. 126 + -15x = 21 + 15x + -15x Combine like terms: 15x + -15x = 0 126 + -15x = 21 + 0 126 + -15x = 21 Add '-126' to each side of the equation. 126 + -126 + -15x = 21 + -126 Combine like terms: 126 + -126 = 0 0 + -15x = 21 + -126 -15x = 21 + -126 Combine like terms: 21 + -126 = -105 -15x = -105 Divide each side by '-15'. x = 7 Simplifying x = 7
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