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Simplifying -3x + -9 = 7x + 21 Reorder the terms: -9 + -3x = 7x + 21 Reorder the terms: -9 + -3x = 21 + 7x Solving -9 + -3x = 21 + 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. -9 + -3x + -7x = 21 + 7x + -7x Combine like terms: -3x + -7x = -10x -9 + -10x = 21 + 7x + -7x Combine like terms: 7x + -7x = 0 -9 + -10x = 21 + 0 -9 + -10x = 21 Add '9' to each side of the equation. -9 + 9 + -10x = 21 + 9 Combine like terms: -9 + 9 = 0 0 + -10x = 21 + 9 -10x = 21 + 9 Combine like terms: 21 + 9 = 30 -10x = 30 Divide each side by '-10'. x = -3 Simplifying x = -3
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