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Simplifying 2(2x + 21) = x + 13 Reorder the terms: 2(21 + 2x) = x + 13 (21 * 2 + 2x * 2) = x + 13 (42 + 4x) = x + 13 Reorder the terms: 42 + 4x = 13 + x Solving 42 + 4x = 13 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 42 + 4x + -1x = 13 + x + -1x Combine like terms: 4x + -1x = 3x 42 + 3x = 13 + x + -1x Combine like terms: x + -1x = 0 42 + 3x = 13 + 0 42 + 3x = 13 Add '-42' to each side of the equation. 42 + -42 + 3x = 13 + -42 Combine like terms: 42 + -42 = 0 0 + 3x = 13 + -42 3x = 13 + -42 Combine like terms: 13 + -42 = -29 3x = -29 Divide each side by '3'. x = -9.666666667 Simplifying x = -9.666666667
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