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Simplifying -0.2(x + 9) + 0.4(x + 9) = 0.2x + 1.8 Reorder the terms: -0.2(9 + x) + 0.4(x + 9) = 0.2x + 1.8 (9 * -0.2 + x * -0.2) + 0.4(x + 9) = 0.2x + 1.8 (-1.8 + -0.2x) + 0.4(x + 9) = 0.2x + 1.8 Reorder the terms: -1.8 + -0.2x + 0.4(9 + x) = 0.2x + 1.8 -1.8 + -0.2x + (9 * 0.4 + x * 0.4) = 0.2x + 1.8 -1.8 + -0.2x + (3.6 + 0.4x) = 0.2x + 1.8 Reorder the terms: -1.8 + 3.6 + -0.2x + 0.4x = 0.2x + 1.8 Combine like terms: -1.8 + 3.6 = 1.8 1.8 + -0.2x + 0.4x = 0.2x + 1.8 Combine like terms: -0.2x + 0.4x = 0.2x 1.8 + 0.2x = 0.2x + 1.8 Reorder the terms: 1.8 + 0.2x = 1.8 + 0.2x Add '-1.8' to each side of the equation. 1.8 + -1.8 + 0.2x = 1.8 + -1.8 + 0.2x Combine like terms: 1.8 + -1.8 = 0.0 0.0 + 0.2x = 1.8 + -1.8 + 0.2x 0.2x = 1.8 + -1.8 + 0.2x Combine like terms: 1.8 + -1.8 = 0.0 0.2x = 0.0 + 0.2x 0.2x = 0.2x Add '-0.2x' to each side of the equation. 0.2x + -0.2x = 0.2x + -0.2x Combine like terms: 0.2x + -0.2x = 0.0 0.0 = 0.2x + -0.2x Combine like terms: 0.2x + -0.2x = 0.0 0.0 = 0.0 Solving 0.0 = 0.0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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