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Simplifying 8l + 10(84 + -0.8l) = 840 8l + (84 * 10 + -0.8l * 10) = 840 8l + (840 + -8l) = 840 Reorder the terms: 840 + 8l + -8l = 840 Combine like terms: 8l + -8l = 0 840 + 0 = 840 840 = 840 Add '-840' to each side of the equation. 840 + -840 = 840 + -840 Combine like terms: 840 + -840 = 0 0 = 840 + -840 Combine like terms: 840 + -840 = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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