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Simplifying 7x + 21 = -21 + -3x Reorder the terms: 21 + 7x = -21 + -3x Solving 21 + 7x = -21 + -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. 21 + 7x + 3x = -21 + -3x + 3x Combine like terms: 7x + 3x = 10x 21 + 10x = -21 + -3x + 3x Combine like terms: -3x + 3x = 0 21 + 10x = -21 + 0 21 + 10x = -21 Add '-21' to each side of the equation. 21 + -21 + 10x = -21 + -21 Combine like terms: 21 + -21 = 0 0 + 10x = -21 + -21 10x = -21 + -21 Combine like terms: -21 + -21 = -42 10x = -42 Divide each side by '10'. x = -4.2 Simplifying x = -4.2
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