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Simplifying 7x + -5(x + 3) = 2x + -15 Reorder the terms: 7x + -5(3 + x) = 2x + -15 7x + (3 * -5 + x * -5) = 2x + -15 7x + (-15 + -5x) = 2x + -15 Reorder the terms: -15 + 7x + -5x = 2x + -15 Combine like terms: 7x + -5x = 2x -15 + 2x = 2x + -15 Reorder the terms: -15 + 2x = -15 + 2x Add '15' to each side of the equation. -15 + 15 + 2x = -15 + 15 + 2x Combine like terms: -15 + 15 = 0 0 + 2x = -15 + 15 + 2x 2x = -15 + 15 + 2x Combine like terms: -15 + 15 = 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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