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Simplifying 7v + -21 = 7(v + -4) + 7 Reorder the terms: -21 + 7v = 7(v + -4) + 7 Reorder the terms: -21 + 7v = 7(-4 + v) + 7 -21 + 7v = (-4 * 7 + v * 7) + 7 -21 + 7v = (-28 + 7v) + 7 Reorder the terms: -21 + 7v = -28 + 7 + 7v Combine like terms: -28 + 7 = -21 -21 + 7v = -21 + 7v Add '21' to each side of the equation. -21 + 21 + 7v = -21 + 21 + 7v Combine like terms: -21 + 21 = 0 0 + 7v = -21 + 21 + 7v 7v = -21 + 21 + 7v Combine like terms: -21 + 21 = 0 7v = 0 + 7v 7v = 7v Add '-7v' to each side of the equation. 7v + -7v = 7v + -7v Combine like terms: 7v + -7v = 0 0 = 7v + -7v Combine like terms: 7v + -7v = 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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