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Simplifying 7x + -3(x + -5) = 4x + 15 Reorder the terms: 7x + -3(-5 + x) = 4x + 15 7x + (-5 * -3 + x * -3) = 4x + 15 7x + (15 + -3x) = 4x + 15 Reorder the terms: 15 + 7x + -3x = 4x + 15 Combine like terms: 7x + -3x = 4x 15 + 4x = 4x + 15 Reorder the terms: 15 + 4x = 15 + 4x Add '-15' to each side of the equation. 15 + -15 + 4x = 15 + -15 + 4x Combine like terms: 15 + -15 = 0 0 + 4x = 15 + -15 + 4x 4x = 15 + -15 + 4x Combine like terms: 15 + -15 = 0 4x = 0 + 4x 4x = 4x Add '-4x' to each side of the equation. 4x + -4x = 4x + -4x Combine like terms: 4x + -4x = 0 0 = 4x + -4x Combine like terms: 4x + -4x = 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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