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Simplifying -7x + 5(-4x + -9) = 90 Reorder the terms: -7x + 5(-9 + -4x) = 90 -7x + (-9 * 5 + -4x * 5) = 90 -7x + (-45 + -20x) = 90 Reorder the terms: -45 + -7x + -20x = 90 Combine like terms: -7x + -20x = -27x -45 + -27x = 90 Solving -45 + -27x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 45 + -27x = 90 + 45 Combine like terms: -45 + 45 = 0 0 + -27x = 90 + 45 -27x = 90 + 45 Combine like terms: 90 + 45 = 135 -27x = 135 Divide each side by '-27'. x = -5 Simplifying x = -5
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