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Simplifying 7(x + 1) + 8x = -21 Reorder the terms: 7(1 + x) + 8x = -21 (1 * 7 + x * 7) + 8x = -21 (7 + 7x) + 8x = -21 Combine like terms: 7x + 8x = 15x 7 + 15x = -21 Solving 7 + 15x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 15x = -21 + -7 Combine like terms: 7 + -7 = 0 0 + 15x = -21 + -7 15x = -21 + -7 Combine like terms: -21 + -7 = -28 15x = -28 Divide each side by '15'. x = -1.866666667 Simplifying x = -1.866666667
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