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Simplifying 2(x + -4) + -1 = 21 Reorder the terms: 2(-4 + x) + -1 = 21 (-4 * 2 + x * 2) + -1 = 21 (-8 + 2x) + -1 = 21 Reorder the terms: -8 + -1 + 2x = 21 Combine like terms: -8 + -1 = -9 -9 + 2x = 21 Solving -9 + 2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 2x = 21 + 9 Combine like terms: -9 + 9 = 0 0 + 2x = 21 + 9 2x = 21 + 9 Combine like terms: 21 + 9 = 30 2x = 30 Divide each side by '2'. x = 15 Simplifying x = 15
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