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Simplifying 8 + 4 = 3x + -21 Combine like terms: 8 + 4 = 12 12 = 3x + -21 Reorder the terms: 12 = -21 + 3x Solving 12 = -21 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 12 + -3x = -21 + 3x + -3x Combine like terms: 3x + -3x = 0 12 + -3x = -21 + 0 12 + -3x = -21 Add '-12' to each side of the equation. 12 + -12 + -3x = -21 + -12 Combine like terms: 12 + -12 = 0 0 + -3x = -21 + -12 -3x = -21 + -12 Combine like terms: -21 + -12 = -33 -3x = -33 Divide each side by '-3'. x = 11 Simplifying x = 11
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