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Simplifying 3x + -4(7 + -1x) = 21 3x + (7 * -4 + -1x * -4) = 21 3x + (-28 + 4x) = 21 Reorder the terms: -28 + 3x + 4x = 21 Combine like terms: 3x + 4x = 7x -28 + 7x = 21 Solving -28 + 7x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + 7x = 21 + 28 Combine like terms: -28 + 28 = 0 0 + 7x = 21 + 28 7x = 21 + 28 Combine like terms: 21 + 28 = 49 7x = 49 Divide each side by '7'. x = 7 Simplifying x = 7
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