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Simplifying 7(y + -3) = 3y + -1(21 + -4y) Reorder the terms: 7(-3 + y) = 3y + -1(21 + -4y) (-3 * 7 + y * 7) = 3y + -1(21 + -4y) (-21 + 7y) = 3y + -1(21 + -4y) -21 + 7y = 3y + (21 * -1 + -4y * -1) -21 + 7y = 3y + (-21 + 4y) Reorder the terms: -21 + 7y = -21 + 3y + 4y Combine like terms: 3y + 4y = 7y -21 + 7y = -21 + 7y Add '21' to each side of the equation. -21 + 21 + 7y = -21 + 21 + 7y Combine like terms: -21 + 21 = 0 0 + 7y = -21 + 21 + 7y 7y = -21 + 21 + 7y Combine like terms: -21 + 21 = 0 7y = 0 + 7y 7y = 7y Add '-7y' to each side of the equation. 7y + -7y = 7y + -7y Combine like terms: 7y + -7y = 0 0 = 7y + -7y Combine like terms: 7y + -7y = 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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