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Simplifying -21(x + -8) + 3x = -21 Reorder the terms: -21(-8 + x) + 3x = -21 (-8 * -21 + x * -21) + 3x = -21 (168 + -21x) + 3x = -21 Combine like terms: -21x + 3x = -18x 168 + -18x = -21 Solving 168 + -18x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-168' to each side of the equation. 168 + -168 + -18x = -21 + -168 Combine like terms: 168 + -168 = 0 0 + -18x = -21 + -168 -18x = -21 + -168 Combine like terms: -21 + -168 = -189 -18x = -189 Divide each side by '-18'. x = 10.5 Simplifying x = 10.5
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