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Simplifying 21x + 12 = 7x + 12 Reorder the terms: 12 + 21x = 7x + 12 Reorder the terms: 12 + 21x = 12 + 7x Add '-12' to each side of the equation. 12 + -12 + 21x = 12 + -12 + 7x Combine like terms: 12 + -12 = 0 0 + 21x = 12 + -12 + 7x 21x = 12 + -12 + 7x Combine like terms: 12 + -12 = 0 21x = 0 + 7x 21x = 7x Solving 21x = 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 21x + -7x = 7x + -7x Combine like terms: 21x + -7x = 14x 14x = 7x + -7x Combine like terms: 7x + -7x = 0 14x = 0 Divide each side by '14'. x = 0 Simplifying x = 0
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