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Simplifying 9x + 20 = -90 + -1x Reorder the terms: 20 + 9x = -90 + -1x Solving 20 + 9x = -90 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 20 + 9x + x = -90 + -1x + x Combine like terms: 9x + x = 10x 20 + 10x = -90 + -1x + x Combine like terms: -1x + x = 0 20 + 10x = -90 + 0 20 + 10x = -90 Add '-20' to each side of the equation. 20 + -20 + 10x = -90 + -20 Combine like terms: 20 + -20 = 0 0 + 10x = -90 + -20 10x = -90 + -20 Combine like terms: -90 + -20 = -110 10x = -110 Divide each side by '10'. x = -11 Simplifying x = -11
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