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Simplifying 7x + -17 = 4 + 7x + -21 Reorder the terms: -17 + 7x = 4 + 7x + -21 Reorder the terms: -17 + 7x = 4 + -21 + 7x Combine like terms: 4 + -21 = -17 -17 + 7x = -17 + 7x Add '17' to each side of the equation. -17 + 17 + 7x = -17 + 17 + 7x Combine like terms: -17 + 17 = 0 0 + 7x = -17 + 17 + 7x 7x = -17 + 17 + 7x Combine like terms: -17 + 17 = 0 7x = 0 + 7x 7x = 7x Add '-7x' to each side of the equation. 7x + -7x = 7x + -7x Combine like terms: 7x + -7x = 0 0 = 7x + -7x 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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