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Simplifying 6x + 7(18 + -3x) = -9 6x + (18 * 7 + -3x * 7) = -9 6x + (126 + -21x) = -9 Reorder the terms: 126 + 6x + -21x = -9 Combine like terms: 6x + -21x = -15x 126 + -15x = -9 Solving 126 + -15x = -9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-126' to each side of the equation. 126 + -126 + -15x = -9 + -126 Combine like terms: 126 + -126 = 0 0 + -15x = -9 + -126 -15x = -9 + -126 Combine like terms: -9 + -126 = -135 -15x = -135 Divide each side by '-15'. x = 9 Simplifying x = 9
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