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Simplifying 3 + -2(x + 2) = -7x + -21 Reorder the terms: 3 + -2(2 + x) = -7x + -21 3 + (2 * -2 + x * -2) = -7x + -21 3 + (-4 + -2x) = -7x + -21 Combine like terms: 3 + -4 = -1 -1 + -2x = -7x + -21 Reorder the terms: -1 + -2x = -21 + -7x Solving -1 + -2x = -21 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. -1 + -2x + 7x = -21 + -7x + 7x Combine like terms: -2x + 7x = 5x -1 + 5x = -21 + -7x + 7x Combine like terms: -7x + 7x = 0 -1 + 5x = -21 + 0 -1 + 5x = -21 Add '1' to each side of the equation. -1 + 1 + 5x = -21 + 1 Combine like terms: -1 + 1 = 0 0 + 5x = -21 + 1 5x = -21 + 1 Combine like terms: -21 + 1 = -20 5x = -20 Divide each side by '5'. x = -4 Simplifying x = -4
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