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Simplifying (7x + -4) + (-7x + 4) = 0 Reorder the terms: (-4 + 7x) + (-7x + 4) = 0 Remove parenthesis around (-4 + 7x) -4 + 7x + (-7x + 4) = 0 Reorder the terms: -4 + 7x + (4 + -7x) = 0 Remove parenthesis around (4 + -7x) -4 + 7x + 4 + -7x = 0 Reorder the terms: -4 + 4 + 7x + -7x = 0 Combine like terms: -4 + 4 = 0 0 + 7x + -7x = 0 7x + -7x = 0 Combine like terms: 7x + -7x = 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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