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