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Simplifying 10x + 21(X + -5) = 81 Reorder the terms: 10x + 21(-5 + X) = 81 10x + (-5 * 21 + X * 21) = 81 10x + (-105 + 21X) = 81 Reorder the terms: -105 + 21X + 10x = 81 Solving -105 + 21X + 10x = 81 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '105' to each side of the equation. -105 + 21X + 105 + 10x = 81 + 105 Reorder the terms: -105 + 105 + 21X + 10x = 81 + 105 Combine like terms: -105 + 105 = 0 0 + 21X + 10x = 81 + 105 21X + 10x = 81 + 105 Combine like terms: 81 + 105 = 186 21X + 10x = 186 Add '-10x' to each side of the equation. 21X + 10x + -10x = 186 + -10x Combine like terms: 10x + -10x = 0 21X + 0 = 186 + -10x 21X = 186 + -10x Divide each side by '21'. X = 8.857142857 + -0.4761904762x Simplifying X = 8.857142857 + -0.4761904762x
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