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Simplifying 2x + -3(x + 5) = -21 Reorder the terms: 2x + -3(5 + x) = -21 2x + (5 * -3 + x * -3) = -21 2x + (-15 + -3x) = -21 Reorder the terms: -15 + 2x + -3x = -21 Combine like terms: 2x + -3x = -1x -15 + -1x = -21 Solving -15 + -1x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + -1x = -21 + 15 Combine like terms: -15 + 15 = 0 0 + -1x = -21 + 15 -1x = -21 + 15 Combine like terms: -21 + 15 = -6 -1x = -6 Divide each side by '-1'. x = 6 Simplifying x = 6
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