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Simplifying 30 + 9x = x + 21 Reorder the terms: 30 + 9x = 21 + x Solving 30 + 9x = 21 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 30 + 9x + -1x = 21 + x + -1x Combine like terms: 9x + -1x = 8x 30 + 8x = 21 + x + -1x Combine like terms: x + -1x = 0 30 + 8x = 21 + 0 30 + 8x = 21 Add '-30' to each side of the equation. 30 + -30 + 8x = 21 + -30 Combine like terms: 30 + -30 = 0 0 + 8x = 21 + -30 8x = 21 + -30 Combine like terms: 21 + -30 = -9 8x = -9 Divide each side by '8'. x = -1.125 Simplifying x = -1.125
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