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Simplifying 7x + 9(x + 3) = 9x + -4 Reorder the terms: 7x + 9(3 + x) = 9x + -4 7x + (3 * 9 + x * 9) = 9x + -4 7x + (27 + 9x) = 9x + -4 Reorder the terms: 27 + 7x + 9x = 9x + -4 Combine like terms: 7x + 9x = 16x 27 + 16x = 9x + -4 Reorder the terms: 27 + 16x = -4 + 9x Solving 27 + 16x = -4 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 27 + 16x + -9x = -4 + 9x + -9x Combine like terms: 16x + -9x = 7x 27 + 7x = -4 + 9x + -9x Combine like terms: 9x + -9x = 0 27 + 7x = -4 + 0 27 + 7x = -4 Add '-27' to each side of the equation. 27 + -27 + 7x = -4 + -27 Combine like terms: 27 + -27 = 0 0 + 7x = -4 + -27 7x = -4 + -27 Combine like terms: -4 + -27 = -31 7x = -31 Divide each side by '7'. x = -4.428571429 Simplifying x = -4.428571429
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