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Simplifying 168 = 3x + 3(4x + 21) Reorder the terms: 168 = 3x + 3(21 + 4x) 168 = 3x + (21 * 3 + 4x * 3) 168 = 3x + (63 + 12x) Reorder the terms: 168 = 63 + 3x + 12x Combine like terms: 3x + 12x = 15x 168 = 63 + 15x Solving 168 = 63 + 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. 168 + -15x = 63 + 15x + -15x Combine like terms: 15x + -15x = 0 168 + -15x = 63 + 0 168 + -15x = 63 Add '-168' to each side of the equation. 168 + -168 + -15x = 63 + -168 Combine like terms: 168 + -168 = 0 0 + -15x = 63 + -168 -15x = 63 + -168 Combine like terms: 63 + -168 = -105 -15x = -105 Divide each side by '-15'. x = 7 Simplifying x = 7
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