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Simplifying 3x + 9 = 21 + 7x 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 = -4x 9 + -4x = 21 + 7x + -7x Combine like terms: 7x + -7x = 0 9 + -4x = 21 + 0 9 + -4x = 21 Add '-9' to each side of the equation. 9 + -9 + -4x = 21 + -9 Combine like terms: 9 + -9 = 0 0 + -4x = 21 + -9 -4x = 21 + -9 Combine like terms: 21 + -9 = 12 -4x = 12 Divide each side by '-4'. x = -3 Simplifying x = -3
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