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Simplifying (21 + -3x) = (8 + -4x) Remove parenthesis around (21 + -3x) 21 + -3x = (8 + -4x) Remove parenthesis around (8 + -4x) 21 + -3x = 8 + -4x Solving 21 + -3x = 8 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. 21 + -3x + 4x = 8 + -4x + 4x Combine like terms: -3x + 4x = 1x 21 + 1x = 8 + -4x + 4x Combine like terms: -4x + 4x = 0 21 + 1x = 8 + 0 21 + 1x = 8 Add '-21' to each side of the equation. 21 + -21 + 1x = 8 + -21 Combine like terms: 21 + -21 = 0 0 + 1x = 8 + -21 1x = 8 + -21 Combine like terms: 8 + -21 = -13 1x = -13 Divide each side by '1'. x = -13 Simplifying x = -13
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