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Simplifying 3 + 2(x + -4) = 21 Reorder the terms: 3 + 2(-4 + x) = 21 3 + (-4 * 2 + x * 2) = 21 3 + (-8 + 2x) = 21 Combine like terms: 3 + -8 = -5 -5 + 2x = 21 Solving -5 + 2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 2x = 21 + 5 Combine like terms: -5 + 5 = 0 0 + 2x = 21 + 5 2x = 21 + 5 Combine like terms: 21 + 5 = 26 2x = 26 Divide each side by '2'. x = 13 Simplifying x = 13
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