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Simplifying (x + 6) + x = 3(x + 6) + x Reorder the terms: (6 + x) + x = 3(x + 6) + x Remove parenthesis around (6 + x) 6 + x + x = 3(x + 6) + x Combine like terms: x + x = 2x 6 + 2x = 3(x + 6) + x Reorder the terms: 6 + 2x = 3(6 + x) + x 6 + 2x = (6 * 3 + x * 3) + x 6 + 2x = (18 + 3x) + x Combine like terms: 3x + x = 4x 6 + 2x = 18 + 4x Solving 6 + 2x = 18 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 6 + 2x + -4x = 18 + 4x + -4x Combine like terms: 2x + -4x = -2x 6 + -2x = 18 + 4x + -4x Combine like terms: 4x + -4x = 0 6 + -2x = 18 + 0 6 + -2x = 18 Add '-6' to each side of the equation. 6 + -6 + -2x = 18 + -6 Combine like terms: 6 + -6 = 0 0 + -2x = 18 + -6 -2x = 18 + -6 Combine like terms: 18 + -6 = 12 -2x = 12 Divide each side by '-2'. x = -6 Simplifying x = -6
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