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Simplifying 90 = x + 20 + x + 10 Reorder the terms: 90 = 20 + 10 + x + x Combine like terms: 20 + 10 = 30 90 = 30 + x + x Combine like terms: x + x = 2x 90 = 30 + 2x Solving 90 = 30 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 90 + -2x = 30 + 2x + -2x Combine like terms: 2x + -2x = 0 90 + -2x = 30 + 0 90 + -2x = 30 Add '-90' to each side of the equation. 90 + -90 + -2x = 30 + -90 Combine like terms: 90 + -90 = 0 0 + -2x = 30 + -90 -2x = 30 + -90 Combine like terms: 30 + -90 = -60 -2x = -60 Divide each side by '-2'. x = 30 Simplifying x = 30
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