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Simplifying 2x + -1(21 + x) + 9x = 54 2x + (21 * -1 + x * -1) + 9x = 54 2x + (-21 + -1x) + 9x = 54 Reorder the terms: -21 + 2x + -1x + 9x = 54 Combine like terms: 2x + -1x = 1x -21 + 1x + 9x = 54 Combine like terms: 1x + 9x = 10x -21 + 10x = 54 Solving -21 + 10x = 54 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 10x = 54 + 21 Combine like terms: -21 + 21 = 0 0 + 10x = 54 + 21 10x = 54 + 21 Combine like terms: 54 + 21 = 75 10x = 75 Divide each side by '10'. x = 7.5 Simplifying x = 7.5
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