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Simplifying 21x + 30 = -9x Reorder the terms: 30 + 21x = -9x Solving 30 + 21x = -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. 30 + 21x + 9x = -9x + 9x Combine like terms: 21x + 9x = 30x 30 + 30x = -9x + 9x Combine like terms: -9x + 9x = 0 30 + 30x = 0 Add '-30' to each side of the equation. 30 + -30 + 30x = 0 + -30 Combine like terms: 30 + -30 = 0 0 + 30x = 0 + -30 30x = 0 + -30 Combine like terms: 0 + -30 = -30 30x = -30 Divide each side by '30'. x = -1 Simplifying x = -1
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