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Simplifying -7(4x + -5) + 7 = -28x + 42 Reorder the terms: -7(-5 + 4x) + 7 = -28x + 42 (-5 * -7 + 4x * -7) + 7 = -28x + 42 (35 + -28x) + 7 = -28x + 42 Reorder the terms: 35 + 7 + -28x = -28x + 42 Combine like terms: 35 + 7 = 42 42 + -28x = -28x + 42 Reorder the terms: 42 + -28x = 42 + -28x Add '-42' to each side of the equation. 42 + -42 + -28x = 42 + -42 + -28x Combine like terms: 42 + -42 = 0 0 + -28x = 42 + -42 + -28x -28x = 42 + -42 + -28x Combine like terms: 42 + -42 = 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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