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Simplifying 13.5 = (9)(x + 2x) Combine like terms: x + 2x = 3x 13.5 = 9(3x) Remove parenthesis around (3x) 13.5 = 9 * 3x Multiply 9 * 3 13.5 = 27x Solving 13.5 = 27x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-27x' to each side of the equation. 13.5 + -27x = 27x + -27x Combine like terms: 27x + -27x = 0 13.5 + -27x = 0 Add '-13.5' to each side of the equation. 13.5 + -13.5 + -27x = 0 + -13.5 Combine like terms: 13.5 + -13.5 = 0.0 0.0 + -27x = 0 + -13.5 -27x = 0 + -13.5 Combine like terms: 0 + -13.5 = -13.5 -27x = -13.5 Divide each side by '-27'. x = 0.5 Simplifying x = 0.5
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