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Simplifying 7x + -1(3x + 3) = 21 Reorder the terms: 7x + -1(3 + 3x) = 21 7x + (3 * -1 + 3x * -1) = 21 7x + (-3 + -3x) = 21 Reorder the terms: -3 + 7x + -3x = 21 Combine like terms: 7x + -3x = 4x -3 + 4x = 21 Solving -3 + 4x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 4x = 21 + 3 Combine like terms: -3 + 3 = 0 0 + 4x = 21 + 3 4x = 21 + 3 Combine like terms: 21 + 3 = 24 4x = 24 Divide each side by '4'. x = 6 Simplifying x = 6
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