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Simplifying 7x + (x + 20) = 90 Reorder the terms: 7x + (20 + x) = 90 Remove parenthesis around (20 + x) 7x + 20 + x = 90 Reorder the terms: 20 + 7x + x = 90 Combine like terms: 7x + x = 8x 20 + 8x = 90 Solving 20 + 8x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 8x = 90 + -20 Combine like terms: 20 + -20 = 0 0 + 8x = 90 + -20 8x = 90 + -20 Combine like terms: 90 + -20 = 70 8x = 70 Divide each side by '8'. x = 8.75 Simplifying x = 8.75
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