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