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Simplifying (21x + -9) = (15x + 15) Reorder the terms: (-9 + 21x) = (15x + 15) Remove parenthesis around (-9 + 21x) -9 + 21x = (15x + 15) Reorder the terms: -9 + 21x = (15 + 15x) Remove parenthesis around (15 + 15x) -9 + 21x = 15 + 15x Solving -9 + 21x = 15 + 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. -9 + 21x + -15x = 15 + 15x + -15x Combine like terms: 21x + -15x = 6x -9 + 6x = 15 + 15x + -15x Combine like terms: 15x + -15x = 0 -9 + 6x = 15 + 0 -9 + 6x = 15 Add '9' to each side of the equation. -9 + 9 + 6x = 15 + 9 Combine like terms: -9 + 9 = 0 0 + 6x = 15 + 9 6x = 15 + 9 Combine like terms: 15 + 9 = 24 6x = 24 Divide each side by '6'. x = 4 Simplifying x = 4
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