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Simplifying 9 = 4x + 30 + -5x Reorder the terms: 9 = 30 + 4x + -5x Combine like terms: 4x + -5x = -1x 9 = 30 + -1x Solving 9 = 30 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 9 + x = 30 + -1x + x Combine like terms: -1x + x = 0 9 + x = 30 + 0 9 + x = 30 Add '-9' to each side of the equation. 9 + -9 + x = 30 + -9 Combine like terms: 9 + -9 = 0 0 + x = 30 + -9 x = 30 + -9 Combine like terms: 30 + -9 = 21 x = 21 Simplifying x = 21
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