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Simplifying 12x + 5x + -3(x + 7) = 0 Reorder the terms: 12x + 5x + -3(7 + x) = 0 12x + 5x + (7 * -3 + x * -3) = 0 12x + 5x + (-21 + -3x) = 0 Reorder the terms: -21 + 12x + 5x + -3x = 0 Combine like terms: 12x + 5x = 17x -21 + 17x + -3x = 0 Combine like terms: 17x + -3x = 14x -21 + 14x = 0 Solving -21 + 14x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 14x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 14x = 0 + 21 14x = 0 + 21 Combine like terms: 0 + 21 = 21 14x = 21 Divide each side by '14'. x = 1.5 Simplifying x = 1.5
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