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Simplifying 28x + -16(x + 2) + -12(x + 4) = -80 Reorder the terms: 28x + -16(2 + x) + -12(x + 4) = -80 28x + (2 * -16 + x * -16) + -12(x + 4) = -80 28x + (-32 + -16x) + -12(x + 4) = -80 Reorder the terms: 28x + -32 + -16x + -12(4 + x) = -80 28x + -32 + -16x + (4 * -12 + x * -12) = -80 28x + -32 + -16x + (-48 + -12x) = -80 Reorder the terms: -32 + -48 + 28x + -16x + -12x = -80 Combine like terms: -32 + -48 = -80 -80 + 28x + -16x + -12x = -80 Combine like terms: 28x + -16x = 12x -80 + 12x + -12x = -80 Combine like terms: 12x + -12x = 0 -80 + 0 = -80 -80 = -80 Add '80' to each side of the equation. -80 + 80 = -80 + 80 Combine like terms: -80 + 80 = 0 0 = -80 + 80 Combine like terms: -80 + 80 = 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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