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Simplifying 15 = x + (x + 4) Reorder the terms: 15 = x + (4 + x) Remove parenthesis around (4 + x) 15 = x + 4 + x Reorder the terms: 15 = 4 + x + x Combine like terms: x + x = 2x 15 = 4 + 2x Solving 15 = 4 + 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. 15 + -2x = 4 + 2x + -2x Combine like terms: 2x + -2x = 0 15 + -2x = 4 + 0 15 + -2x = 4 Add '-15' to each side of the equation. 15 + -15 + -2x = 4 + -15 Combine like terms: 15 + -15 = 0 0 + -2x = 4 + -15 -2x = 4 + -15 Combine like terms: 4 + -15 = -11 -2x = -11 Divide each side by '-2'. x = 5.5 Simplifying x = 5.5
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