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Simplifying 21 + -1(x + 8) = 5x + -5 Reorder the terms: 21 + -1(8 + x) = 5x + -5 21 + (8 * -1 + x * -1) = 5x + -5 21 + (-8 + -1x) = 5x + -5 Combine like terms: 21 + -8 = 13 13 + -1x = 5x + -5 Reorder the terms: 13 + -1x = -5 + 5x Solving 13 + -1x = -5 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. 13 + -1x + -5x = -5 + 5x + -5x Combine like terms: -1x + -5x = -6x 13 + -6x = -5 + 5x + -5x Combine like terms: 5x + -5x = 0 13 + -6x = -5 + 0 13 + -6x = -5 Add '-13' to each side of the equation. 13 + -13 + -6x = -5 + -13 Combine like terms: 13 + -13 = 0 0 + -6x = -5 + -13 -6x = -5 + -13 Combine like terms: -5 + -13 = -18 -6x = -18 Divide each side by '-6'. x = 3 Simplifying x = 3
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