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