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Simplifying 4x + 9(10 + x) = 50 4x + (10 * 9 + x * 9) = 50 4x + (90 + 9x) = 50 Reorder the terms: 90 + 4x + 9x = 50 Combine like terms: 4x + 9x = 13x 90 + 13x = 50 Solving 90 + 13x = 50 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-90' to each side of the equation. 90 + -90 + 13x = 50 + -90 Combine like terms: 90 + -90 = 0 0 + 13x = 50 + -90 13x = 50 + -90 Combine like terms: 50 + -90 = -40 13x = -40 Divide each side by '13'. x = -3.076923077 Simplifying x = -3.076923077
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