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Simplifying 30x + 15 = 9x + -42 Reorder the terms: 15 + 30x = 9x + -42 Reorder the terms: 15 + 30x = -42 + 9x Solving 15 + 30x = -42 + 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. 15 + 30x + -9x = -42 + 9x + -9x Combine like terms: 30x + -9x = 21x 15 + 21x = -42 + 9x + -9x Combine like terms: 9x + -9x = 0 15 + 21x = -42 + 0 15 + 21x = -42 Add '-15' to each side of the equation. 15 + -15 + 21x = -42 + -15 Combine like terms: 15 + -15 = 0 0 + 21x = -42 + -15 21x = -42 + -15 Combine like terms: -42 + -15 = -57 21x = -57 Divide each side by '21'. x = -2.714285714 Simplifying x = -2.714285714
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