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Simplifying -15y + 21 = 3(-5y + 7) Reorder the terms: 21 + -15y = 3(-5y + 7) Reorder the terms: 21 + -15y = 3(7 + -5y) 21 + -15y = (7 * 3 + -5y * 3) 21 + -15y = (21 + -15y) Add '-21' to each side of the equation. 21 + -21 + -15y = 21 + -21 + -15y Combine like terms: 21 + -21 = 0 0 + -15y = 21 + -21 + -15y -15y = 21 + -21 + -15y Combine like terms: 21 + -21 = 0 -15y = 0 + -15y -15y = -15y Add '15y' to each side of the equation. -15y + 15y = -15y + 15y Combine like terms: -15y + 15y = 0 0 = -15y + 15y Combine like terms: -15y + 15y = 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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