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Simplifying 7(3y + -9) = 21y + -63 Reorder the terms: 7(-9 + 3y) = 21y + -63 (-9 * 7 + 3y * 7) = 21y + -63 (-63 + 21y) = 21y + -63 Reorder the terms: -63 + 21y = -63 + 21y Add '63' to each side of the equation. -63 + 63 + 21y = -63 + 63 + 21y Combine like terms: -63 + 63 = 0 0 + 21y = -63 + 63 + 21y 21y = -63 + 63 + 21y Combine like terms: -63 + 63 = 0 21y = 0 + 21y 21y = 21y Add '-21y' to each side of the equation. 21y + -21y = 21y + -21y Combine like terms: 21y + -21y = 0 0 = 21y + -21y Combine like terms: 21y + -21y = 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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