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Simplifying 7 + 7x + -1(-2x) + 3 = 9x + 10 Remove parenthesis around (-2x) 7 + 7x + -1 * -2x + 3 = 9x + 10 Multiply -1 * -2 7 + 7x + 2x + 3 = 9x + 10 Reorder the terms: 7 + 3 + 7x + 2x = 9x + 10 Combine like terms: 7 + 3 = 10 10 + 7x + 2x = 9x + 10 Combine like terms: 7x + 2x = 9x 10 + 9x = 9x + 10 Reorder the terms: 10 + 9x = 10 + 9x Add '-10' to each side of the equation. 10 + -10 + 9x = 10 + -10 + 9x Combine like terms: 10 + -10 = 0 0 + 9x = 10 + -10 + 9x 9x = 10 + -10 + 9x Combine like terms: 10 + -10 = 0 9x = 0 + 9x 9x = 9x Add '-9x' to each side of the equation. 9x + -9x = 9x + -9x Combine like terms: 9x + -9x = 0 0 = 9x + -9x Combine like terms: 9x + -9x = 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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