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