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Simplifying (40(22.5 + -0.125y)) + 5y = 900 ((22.5 * 40 + -0.125y * 40)) + 5y = 900 ((900 + -5y)) + 5y = 900 (900 + -5y) + 5y = 900 Remove parenthesis around (900 + -5y) 900 + -5y + 5y = 900 Combine like terms: -5y + 5y = 0 900 + 0 = 900 900 = 900 Add '-900' to each side of the equation. 900 + -900 = 900 + -900 Combine like terms: 900 + -900 = 0 0 = 900 + -900 Combine like terms: 900 + -900 = 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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