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Simplifying 7 = (7 + -3Y) + 3Y Remove parenthesis around (7 + -3Y) 7 = 7 + -3Y + 3Y Combine like terms: -3Y + 3Y = 0 7 = 7 + 0 7 = 7 Add '-7' to each side of the equation. 7 + -7 = 7 + -7 Combine like terms: 7 + -7 = 0 0 = 7 + -7 Combine like terms: 7 + -7 = 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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