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Simplifying 3 + 12 = 2(x + -9) + -7x Combine like terms: 3 + 12 = 15 15 = 2(x + -9) + -7x Reorder the terms: 15 = 2(-9 + x) + -7x 15 = (-9 * 2 + x * 2) + -7x 15 = (-18 + 2x) + -7x Combine like terms: 2x + -7x = -5x 15 = -18 + -5x Solving 15 = -18 + -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. 15 + 5x = -18 + -5x + 5x Combine like terms: -5x + 5x = 0 15 + 5x = -18 + 0 15 + 5x = -18 Add '-15' to each side of the equation. 15 + -15 + 5x = -18 + -15 Combine like terms: 15 + -15 = 0 0 + 5x = -18 + -15 5x = -18 + -15 Combine like terms: -18 + -15 = -33 5x = -33 Divide each side by '5'. x = -6.6 Simplifying x = -6.6
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