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Simplifying 7x + -9 = 3x + 21 Reorder the terms: -9 + 7x = 3x + 21 Reorder the terms: -9 + 7x = 21 + 3x Solving -9 + 7x = 21 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -9 + 7x + -3x = 21 + 3x + -3x Combine like terms: 7x + -3x = 4x -9 + 4x = 21 + 3x + -3x Combine like terms: 3x + -3x = 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 = 30 4x = 30 Divide each side by '4'. x = 7.5 Simplifying x = 7.5
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