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Simplifying 21 + -2(x + 5) = 11 + -2 Reorder the terms: 21 + -2(5 + x) = 11 + -2 21 + (5 * -2 + x * -2) = 11 + -2 21 + (-10 + -2x) = 11 + -2 Combine like terms: 21 + -10 = 11 11 + -2x = 11 + -2 Combine like terms: 11 + -2 = 9 11 + -2x = 9 Solving 11 + -2x = 9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + -2x = 9 + -11 Combine like terms: 11 + -11 = 0 0 + -2x = 9 + -11 -2x = 9 + -11 Combine like terms: 9 + -11 = -2 -2x = -2 Divide each side by '-2'. x = 1 Simplifying x = 1
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