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Simplifying 300 = x + (x + 20) Reorder the terms: 300 = x + (20 + x) Remove parenthesis around (20 + x) 300 = x + 20 + x Reorder the terms: 300 = 20 + x + x Combine like terms: x + x = 2x 300 = 20 + 2x Solving 300 = 20 + 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. 300 + -2x = 20 + 2x + -2x Combine like terms: 2x + -2x = 0 300 + -2x = 20 + 0 300 + -2x = 20 Add '-300' to each side of the equation. 300 + -300 + -2x = 20 + -300 Combine like terms: 300 + -300 = 0 0 + -2x = 20 + -300 -2x = 20 + -300 Combine like terms: 20 + -300 = -280 -2x = -280 Divide each side by '-2'. x = 140 Simplifying x = 140
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