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Simplifying (21x) + 6x = (5x)(21) Combine like terms: (21x) + 6x = 27x 27x = (5x)(21) Remove parenthesis around (5x) 27x = 5x(21) Reorder the terms for easier multiplication: 27x = 5 * 21x Multiply 5 * 21 27x = 105x Solving 27x = 105x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-105x' to each side of the equation. 27x + -105x = 105x + -105x Combine like terms: 27x + -105x = -78x -78x = 105x + -105x Combine like terms: 105x + -105x = 0 -78x = 0 Divide each side by '-78'. x = 0 Simplifying x = 0
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