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Simplifying 2(x + -4) + 15 = -21 Reorder the terms: 2(-4 + x) + 15 = -21 (-4 * 2 + x * 2) + 15 = -21 (-8 + 2x) + 15 = -21 Reorder the terms: -8 + 15 + 2x = -21 Combine like terms: -8 + 15 = 7 7 + 2x = -21 Solving 7 + 2x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 2x = -21 + -7 Combine like terms: 7 + -7 = 0 0 + 2x = -21 + -7 2x = -21 + -7 Combine like terms: -21 + -7 = -28 2x = -28 Divide each side by '2'. x = -14 Simplifying x = -14
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