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Simplifying 7(4x + -3) = 28x + -21 Reorder the terms: 7(-3 + 4x) = 28x + -21 (-3 * 7 + 4x * 7) = 28x + -21 (-21 + 28x) = 28x + -21 Reorder the terms: -21 + 28x = -21 + 28x Add '21' to each side of the equation. -21 + 21 + 28x = -21 + 21 + 28x Combine like terms: -21 + 21 = 0 0 + 28x = -21 + 21 + 28x 28x = -21 + 21 + 28x Combine like terms: -21 + 21 = 0 28x = 0 + 28x 28x = 28x Add '-28x' to each side of the equation. 28x + -28x = 28x + -28x Combine like terms: 28x + -28x = 0 0 = 28x + -28x Combine like terms: 28x + -28x = 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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