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Simplifying 7(x + 3) + -9 = 20 + -2x + -8 + 9x Reorder the terms: 7(3 + x) + -9 = 20 + -2x + -8 + 9x (3 * 7 + x * 7) + -9 = 20 + -2x + -8 + 9x (21 + 7x) + -9 = 20 + -2x + -8 + 9x Reorder the terms: 21 + -9 + 7x = 20 + -2x + -8 + 9x Combine like terms: 21 + -9 = 12 12 + 7x = 20 + -2x + -8 + 9x Reorder the terms: 12 + 7x = 20 + -8 + -2x + 9x Combine like terms: 20 + -8 = 12 12 + 7x = 12 + -2x + 9x Combine like terms: -2x + 9x = 7x 12 + 7x = 12 + 7x Add '-12' to each side of the equation. 12 + -12 + 7x = 12 + -12 + 7x Combine like terms: 12 + -12 = 0 0 + 7x = 12 + -12 + 7x 7x = 12 + -12 + 7x Combine like terms: 12 + -12 = 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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