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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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