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Simplifying 4X + 3(x + -3) = 21 + -3X Reorder the terms: 4X + 3(-3 + x) = 21 + -3X 4X + (-3 * 3 + x * 3) = 21 + -3X 4X + (-9 + 3x) = 21 + -3X Reorder the terms: -9 + 4X + 3x = 21 + -3X Solving -9 + 4X + 3x = 21 + -3X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '3X' to each side of the equation. -9 + 4X + 3X + 3x = 21 + -3X + 3X Combine like terms: 4X + 3X = 7X -9 + 7X + 3x = 21 + -3X + 3X Combine like terms: -3X + 3X = 0 -9 + 7X + 3x = 21 + 0 -9 + 7X + 3x = 21 Add '9' to each side of the equation. -9 + 7X + 9 + 3x = 21 + 9 Reorder the terms: -9 + 9 + 7X + 3x = 21 + 9 Combine like terms: -9 + 9 = 0 0 + 7X + 3x = 21 + 9 7X + 3x = 21 + 9 Combine like terms: 21 + 9 = 30 7X + 3x = 30 Add '-3x' to each side of the equation. 7X + 3x + -3x = 30 + -3x Combine like terms: 3x + -3x = 0 7X + 0 = 30 + -3x 7X = 30 + -3x Divide each side by '7'. X = 4.285714286 + -0.4285714286x Simplifying X = 4.285714286 + -0.4285714286x
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