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Simplifying 5x + 2(-2x + -15) = -21 Reorder the terms: 5x + 2(-15 + -2x) = -21 5x + (-15 * 2 + -2x * 2) = -21 5x + (-30 + -4x) = -21 Reorder the terms: -30 + 5x + -4x = -21 Combine like terms: 5x + -4x = 1x -30 + 1x = -21 Solving -30 + 1x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + 1x = -21 + 30 Combine like terms: -30 + 30 = 0 0 + 1x = -21 + 30 1x = -21 + 30 Combine like terms: -21 + 30 = 9 1x = 9 Divide each side by '1'. x = 9 Simplifying x = 9
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