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