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Simplifying 3x + -21 = 5x + -12 Reorder the terms: -21 + 3x = 5x + -12 Reorder the terms: -21 + 3x = -12 + 5x Solving -21 + 3x = -12 + 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. -21 + 3x + -5x = -12 + 5x + -5x Combine like terms: 3x + -5x = -2x -21 + -2x = -12 + 5x + -5x Combine like terms: 5x + -5x = 0 -21 + -2x = -12 + 0 -21 + -2x = -12 Add '21' to each side of the equation. -21 + 21 + -2x = -12 + 21 Combine like terms: -21 + 21 = 0 0 + -2x = -12 + 21 -2x = -12 + 21 Combine like terms: -12 + 21 = 9 -2x = 9 Divide each side by '-2'. x = -4.5 Simplifying x = -4.5
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