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Simplifying 4y(5y + -7) + 20y = 4y(5y + -7) + 20y Reorder the terms: 4y(-7 + 5y) + 20y = 4y(5y + -7) + 20y (-7 * 4y + 5y * 4y) + 20y = 4y(5y + -7) + 20y (-28y + 20y2) + 20y = 4y(5y + -7) + 20y Reorder the terms: -28y + 20y + 20y2 = 4y(5y + -7) + 20y Combine like terms: -28y + 20y = -8y -8y + 20y2 = 4y(5y + -7) + 20y Reorder the terms: -8y + 20y2 = 4y(-7 + 5y) + 20y -8y + 20y2 = (-7 * 4y + 5y * 4y) + 20y -8y + 20y2 = (-28y + 20y2) + 20y Reorder the terms: -8y + 20y2 = -28y + 20y + 20y2 Combine like terms: -28y + 20y = -8y -8y + 20y2 = -8y + 20y2 Add '8y' to each side of the equation. -8y + 8y + 20y2 = -8y + 8y + 20y2 Combine like terms: -8y + 8y = 0 0 + 20y2 = -8y + 8y + 20y2 20y2 = -8y + 8y + 20y2 Combine like terms: -8y + 8y = 0 20y2 = 0 + 20y2 20y2 = 20y2 Add '-20y2' to each side of the equation. 20y2 + -20y2 = 20y2 + -20y2 Combine like terms: 20y2 + -20y2 = 0 0 = 20y2 + -20y2 Combine like terms: 20y2 + -20y2 = 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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