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Simplifying 7(3 + x) = 28 + 7(x + -1) (3 * 7 + x * 7) = 28 + 7(x + -1) (21 + 7x) = 28 + 7(x + -1) Reorder the terms: 21 + 7x = 28 + 7(-1 + x) 21 + 7x = 28 + (-1 * 7 + x * 7) 21 + 7x = 28 + (-7 + 7x) Combine like terms: 28 + -7 = 21 21 + 7x = 21 + 7x Add '-21' to each side of the equation. 21 + -21 + 7x = 21 + -21 + 7x Combine like terms: 21 + -21 = 0 0 + 7x = 21 + -21 + 7x 7x = 21 + -21 + 7x Combine like terms: 21 + -21 = 0 7x = 0 + 7x 7x = 7x Add '-7x' to each side of the equation. 7x + -7x = 7x + -7x Combine like terms: 7x + -7x = 0 0 = 7x + -7x Combine like terms: 7x + -7x = 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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