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Simplifying 9(x + -5) = 4(x + 5) Reorder the terms: 9(-5 + x) = 4(x + 5) (-5 * 9 + x * 9) = 4(x + 5) (-45 + 9x) = 4(x + 5) Reorder the terms: -45 + 9x = 4(5 + x) -45 + 9x = (5 * 4 + x * 4) -45 + 9x = (20 + 4x) Solving -45 + 9x = 20 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. -45 + 9x + -4x = 20 + 4x + -4x Combine like terms: 9x + -4x = 5x -45 + 5x = 20 + 4x + -4x Combine like terms: 4x + -4x = 0 -45 + 5x = 20 + 0 -45 + 5x = 20 Add '45' to each side of the equation. -45 + 45 + 5x = 20 + 45 Combine like terms: -45 + 45 = 0 0 + 5x = 20 + 45 5x = 20 + 45 Combine like terms: 20 + 45 = 65 5x = 65 Divide each side by '5'. x = 13 Simplifying x = 13
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