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Simplifying -90 = -2x + -4(-5x + -9) Reorder the terms: -90 = -2x + -4(-9 + -5x) -90 = -2x + (-9 * -4 + -5x * -4) -90 = -2x + (36 + 20x) Reorder the terms: -90 = 36 + -2x + 20x Combine like terms: -2x + 20x = 18x -90 = 36 + 18x Solving -90 = 36 + 18x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18x' to each side of the equation. -90 + -18x = 36 + 18x + -18x Combine like terms: 18x + -18x = 0 -90 + -18x = 36 + 0 -90 + -18x = 36 Add '90' to each side of the equation. -90 + 90 + -18x = 36 + 90 Combine like terms: -90 + 90 = 0 0 + -18x = 36 + 90 -18x = 36 + 90 Combine like terms: 36 + 90 = 126 -18x = 126 Divide each side by '-18'. x = -7 Simplifying x = -7
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