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Simplifying X = 7 * 3(20 + -1X) Multiply 7 * 3 X = 21(20 + -1X) X = (20 * 21 + -1X * 21) X = (420 + -21X) Solving X = 420 + -21X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '21X' to each side of the equation. X + 21X = 420 + -21X + 21X Combine like terms: X + 21X = 22X 22X = 420 + -21X + 21X Combine like terms: -21X + 21X = 0 22X = 420 + 0 22X = 420 Divide each side by '22'. X = 19.09090909 Simplifying X = 19.09090909
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