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Simplifying -7[6x + 7] = -42x + -49 Reorder the terms: -7[7 + 6x] = -42x + -49 [7 * -7 + 6x * -7] = -42x + -49 [-49 + -42x] = -42x + -49 Reorder the terms: -49 + -42x = -49 + -42x Add '49' to each side of the equation. -49 + 49 + -42x = -49 + 49 + -42x Combine like terms: -49 + 49 = 0 0 + -42x = -49 + 49 + -42x -42x = -49 + 49 + -42x Combine like terms: -49 + 49 = 0 -42x = 0 + -42x -42x = -42x Add '42x' to each side of the equation. -42x + 42x = -42x + 42x Combine like terms: -42x + 42x = 0 0 = -42x + 42x Combine like terms: -42x + 42x = 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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