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Simplifying 7(x + 5) + -4 = 40 + -6x + -9 + 13x Reorder the terms: 7(5 + x) + -4 = 40 + -6x + -9 + 13x (5 * 7 + x * 7) + -4 = 40 + -6x + -9 + 13x (35 + 7x) + -4 = 40 + -6x + -9 + 13x Reorder the terms: 35 + -4 + 7x = 40 + -6x + -9 + 13x Combine like terms: 35 + -4 = 31 31 + 7x = 40 + -6x + -9 + 13x Reorder the terms: 31 + 7x = 40 + -9 + -6x + 13x Combine like terms: 40 + -9 = 31 31 + 7x = 31 + -6x + 13x Combine like terms: -6x + 13x = 7x 31 + 7x = 31 + 7x Add '-31' to each side of the equation. 31 + -31 + 7x = 31 + -31 + 7x Combine like terms: 31 + -31 = 0 0 + 7x = 31 + -31 + 7x 7x = 31 + -31 + 7x Combine like terms: 31 + -31 = 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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