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Simplifying 7x + 13 + -9x = 20 + -18x + 16x + -7 Reorder the terms: 13 + 7x + -9x = 20 + -18x + 16x + -7 Combine like terms: 7x + -9x = -2x 13 + -2x = 20 + -18x + 16x + -7 Reorder the terms: 13 + -2x = 20 + -7 + -18x + 16x Combine like terms: 20 + -7 = 13 13 + -2x = 13 + -18x + 16x Combine like terms: -18x + 16x = -2x 13 + -2x = 13 + -2x Add '-13' to each side of the equation. 13 + -13 + -2x = 13 + -13 + -2x Combine like terms: 13 + -13 = 0 0 + -2x = 13 + -13 + -2x -2x = 13 + -13 + -2x Combine like terms: 13 + -13 = 0 -2x = 0 + -2x -2x = -2x Add '2x' to each side of the equation. -2x + 2x = -2x + 2x Combine like terms: -2x + 2x = 0 0 = -2x + 2x Combine like terms: -2x + 2x = 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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