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