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Simplifying 4(3x + -7) = 12x + -28 Reorder the terms: 4(-7 + 3x) = 12x + -28 (-7 * 4 + 3x * 4) = 12x + -28 (-28 + 12x) = 12x + -28 Reorder the terms: -28 + 12x = -28 + 12x Add '28' to each side of the equation. -28 + 28 + 12x = -28 + 28 + 12x Combine like terms: -28 + 28 = 0 0 + 12x = -28 + 28 + 12x 12x = -28 + 28 + 12x Combine like terms: -28 + 28 = 0 12x = 0 + 12x 12x = 12x Add '-12x' to each side of the equation. 12x + -12x = 12x + -12x Combine like terms: 12x + -12x = 0 0 = 12x + -12x Combine like terms: 12x + -12x = 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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