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Simplifying -21 + 7x + 5x = 12 + 1x Combine like terms: 7x + 5x = 12x -21 + 12x = 12 + 1x Solving -21 + 12x = 12 + 1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -21 + 12x + -1x = 12 + 1x + -1x Combine like terms: 12x + -1x = 11x -21 + 11x = 12 + 1x + -1x Combine like terms: 1x + -1x = 0 -21 + 11x = 12 + 0 -21 + 11x = 12 Add '21' to each side of the equation. -21 + 21 + 11x = 12 + 21 Combine like terms: -21 + 21 = 0 0 + 11x = 12 + 21 11x = 12 + 21 Combine like terms: 12 + 21 = 33 11x = 33 Divide each side by '11'. x = 3 Simplifying x = 3
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