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Simplifying 12 + -7x = 5x + 21 Reorder the terms: 12 + -7x = 21 + 5x Solving 12 + -7x = 21 + 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. 12 + -7x + -5x = 21 + 5x + -5x Combine like terms: -7x + -5x = -12x 12 + -12x = 21 + 5x + -5x Combine like terms: 5x + -5x = 0 12 + -12x = 21 + 0 12 + -12x = 21 Add '-12' to each side of the equation. 12 + -12 + -12x = 21 + -12 Combine like terms: 12 + -12 = 0 0 + -12x = 21 + -12 -12x = 21 + -12 Combine like terms: 21 + -12 = 9 -12x = 9 Divide each side by '-12'. x = -0.75 Simplifying x = -0.75
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