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Simplifying 12 = -3(2x + 3) + 7x Reorder the terms: 12 = -3(3 + 2x) + 7x 12 = (3 * -3 + 2x * -3) + 7x 12 = (-9 + -6x) + 7x Combine like terms: -6x + 7x = 1x 12 = -9 + 1x Solving 12 = -9 + 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. 12 + -1x = -9 + 1x + -1x Combine like terms: 1x + -1x = 0 12 + -1x = -9 + 0 12 + -1x = -9 Add '-12' to each side of the equation. 12 + -12 + -1x = -9 + -12 Combine like terms: 12 + -12 = 0 0 + -1x = -9 + -12 -1x = -9 + -12 Combine like terms: -9 + -12 = -21 -1x = -21 Divide each side by '-1'. x = 21 Simplifying x = 21
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