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Simplifying 5x + 18 + -1(2x + 45) = 21 Reorder the terms: 5x + 18 + -1(45 + 2x) = 21 5x + 18 + (45 * -1 + 2x * -1) = 21 5x + 18 + (-45 + -2x) = 21 Reorder the terms: 18 + -45 + 5x + -2x = 21 Combine like terms: 18 + -45 = -27 -27 + 5x + -2x = 21 Combine like terms: 5x + -2x = 3x -27 + 3x = 21 Solving -27 + 3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '27' to each side of the equation. -27 + 27 + 3x = 21 + 27 Combine like terms: -27 + 27 = 0 0 + 3x = 21 + 27 3x = 21 + 27 Combine like terms: 21 + 27 = 48 3x = 48 Divide each side by '3'. x = 16 Simplifying x = 16
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