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Simplifying 4(7x + 4) + -9 = 28x + 7 Reorder the terms: 4(4 + 7x) + -9 = 28x + 7 (4 * 4 + 7x * 4) + -9 = 28x + 7 (16 + 28x) + -9 = 28x + 7 Reorder the terms: 16 + -9 + 28x = 28x + 7 Combine like terms: 16 + -9 = 7 7 + 28x = 28x + 7 Reorder the terms: 7 + 28x = 7 + 28x Add '-7' to each side of the equation. 7 + -7 + 28x = 7 + -7 + 28x Combine like terms: 7 + -7 = 0 0 + 28x = 7 + -7 + 28x 28x = 7 + -7 + 28x Combine like terms: 7 + -7 = 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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