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Simplifying 2(x + 5) + 8 = 21 + -1x Reorder the terms: 2(5 + x) + 8 = 21 + -1x (5 * 2 + x * 2) + 8 = 21 + -1x (10 + 2x) + 8 = 21 + -1x Reorder the terms: 10 + 8 + 2x = 21 + -1x Combine like terms: 10 + 8 = 18 18 + 2x = 21 + -1x Solving 18 + 2x = 21 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 18 + 2x + x = 21 + -1x + x Combine like terms: 2x + x = 3x 18 + 3x = 21 + -1x + x Combine like terms: -1x + x = 0 18 + 3x = 21 + 0 18 + 3x = 21 Add '-18' to each side of the equation. 18 + -18 + 3x = 21 + -18 Combine like terms: 18 + -18 = 0 0 + 3x = 21 + -18 3x = 21 + -18 Combine like terms: 21 + -18 = 3 3x = 3 Divide each side by '3'. x = 1 Simplifying x = 1
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