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Simplifying x + x + -5 + 2(x + -5) = 21 Reorder the terms: x + x + -5 + 2(-5 + x) = 21 x + x + -5 + (-5 * 2 + x * 2) = 21 x + x + -5 + (-10 + 2x) = 21 Reorder the terms: -5 + -10 + x + x + 2x = 21 Combine like terms: -5 + -10 = -15 -15 + x + x + 2x = 21 Combine like terms: x + x = 2x -15 + 2x + 2x = 21 Combine like terms: 2x + 2x = 4x -15 + 4x = 21 Solving -15 + 4x = 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 + 4x = 21 + 15 Combine like terms: -15 + 15 = 0 0 + 4x = 21 + 15 4x = 21 + 15 Combine like terms: 21 + 15 = 36 4x = 36 Divide each side by '4'. x = 9 Simplifying x = 9
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