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Simplifying 7(x + 9) = 7x + 63 Reorder the terms: 7(9 + x) = 7x + 63 (9 * 7 + x * 7) = 7x + 63 (63 + 7x) = 7x + 63 Reorder the terms: 63 + 7x = 63 + 7x Add '-63' to each side of the equation. 63 + -63 + 7x = 63 + -63 + 7x Combine like terms: 63 + -63 = 0 0 + 7x = 63 + -63 + 7x 7x = 63 + -63 + 7x Combine like terms: 63 + -63 = 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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