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Simplifying 21x + 13 = 9x + 61 Reorder the terms: 13 + 21x = 9x + 61 Reorder the terms: 13 + 21x = 61 + 9x Solving 13 + 21x = 61 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 13 + 21x + -9x = 61 + 9x + -9x Combine like terms: 21x + -9x = 12x 13 + 12x = 61 + 9x + -9x Combine like terms: 9x + -9x = 0 13 + 12x = 61 + 0 13 + 12x = 61 Add '-13' to each side of the equation. 13 + -13 + 12x = 61 + -13 Combine like terms: 13 + -13 = 0 0 + 12x = 61 + -13 12x = 61 + -13 Combine like terms: 61 + -13 = 48 12x = 48 Divide each side by '12'. x = 4 Simplifying x = 4
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