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Simplifying 20 + -4x = 8 + -4(x + -3) Reorder the terms: 20 + -4x = 8 + -4(-3 + x) 20 + -4x = 8 + (-3 * -4 + x * -4) 20 + -4x = 8 + (12 + -4x) Combine like terms: 8 + 12 = 20 20 + -4x = 20 + -4x Add '-20' to each side of the equation. 20 + -20 + -4x = 20 + -20 + -4x Combine like terms: 20 + -20 = 0 0 + -4x = 20 + -20 + -4x -4x = 20 + -20 + -4x Combine like terms: 20 + -20 = 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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