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Simplifying x + -90 = 3x Reorder the terms: -90 + x = 3x Solving -90 + x = 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -90 + x + -3x = 3x + -3x Combine like terms: x + -3x = -2x -90 + -2x = 3x + -3x Combine like terms: 3x + -3x = 0 -90 + -2x = 0 Add '90' to each side of the equation. -90 + 90 + -2x = 0 + 90 Combine like terms: -90 + 90 = 0 0 + -2x = 0 + 90 -2x = 0 + 90 Combine like terms: 0 + 90 = 90 -2x = 90 Divide each side by '-2'. x = -45 Simplifying x = -45
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