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Simplifying 21x + 4 = 12x + 13 Reorder the terms: 4 + 21x = 12x + 13 Reorder the terms: 4 + 21x = 13 + 12x Solving 4 + 21x = 13 + 12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12x' to each side of the equation. 4 + 21x + -12x = 13 + 12x + -12x Combine like terms: 21x + -12x = 9x 4 + 9x = 13 + 12x + -12x Combine like terms: 12x + -12x = 0 4 + 9x = 13 + 0 4 + 9x = 13 Add '-4' to each side of the equation. 4 + -4 + 9x = 13 + -4 Combine like terms: 4 + -4 = 0 0 + 9x = 13 + -4 9x = 13 + -4 Combine like terms: 13 + -4 = 9 9x = 9 Divide each side by '9'. x = 1 Simplifying x = 1
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