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Simplifying 4(x + -7) + 15 = 4x + -13 Reorder the terms: 4(-7 + x) + 15 = 4x + -13 (-7 * 4 + x * 4) + 15 = 4x + -13 (-28 + 4x) + 15 = 4x + -13 Reorder the terms: -28 + 15 + 4x = 4x + -13 Combine like terms: -28 + 15 = -13 -13 + 4x = 4x + -13 Reorder the terms: -13 + 4x = -13 + 4x Add '13' to each side of the equation. -13 + 13 + 4x = -13 + 13 + 4x Combine like terms: -13 + 13 = 0 0 + 4x = -13 + 13 + 4x 4x = -13 + 13 + 4x Combine like terms: -13 + 13 = 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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