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Simplifying 9 = 2(4 + -1x) + 7 9 = (4 * 2 + -1x * 2) + 7 9 = (8 + -2x) + 7 Reorder the terms: 9 = 8 + 7 + -2x Combine like terms: 8 + 7 = 15 9 = 15 + -2x Solving 9 = 15 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. 9 + 2x = 15 + -2x + 2x Combine like terms: -2x + 2x = 0 9 + 2x = 15 + 0 9 + 2x = 15 Add '-9' to each side of the equation. 9 + -9 + 2x = 15 + -9 Combine like terms: 9 + -9 = 0 0 + 2x = 15 + -9 2x = 15 + -9 Combine like terms: 15 + -9 = 6 2x = 6 Divide each side by '2'. x = 3 Simplifying x = 3
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