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Simplifying -21 = -7x + 2(x + -3) Reorder the terms: -21 = -7x + 2(-3 + x) -21 = -7x + (-3 * 2 + x * 2) -21 = -7x + (-6 + 2x) Reorder the terms: -21 = -6 + -7x + 2x Combine like terms: -7x + 2x = -5x -21 = -6 + -5x Solving -21 = -6 + -5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5x' to each side of the equation. -21 + 5x = -6 + -5x + 5x Combine like terms: -5x + 5x = 0 -21 + 5x = -6 + 0 -21 + 5x = -6 Add '21' to each side of the equation. -21 + 21 + 5x = -6 + 21 Combine like terms: -21 + 21 = 0 0 + 5x = -6 + 21 5x = -6 + 21 Combine like terms: -6 + 21 = 15 5x = 15 Divide each side by '5'. x = 3 Simplifying x = 3
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