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Simplifying 7ab + -8cd = 7ab + -8cd Add '-7ab' to each side of the equation. 7ab + -7ab + -8cd = 7ab + -7ab + -8cd Combine like terms: 7ab + -7ab = 0 0 + -8cd = 7ab + -7ab + -8cd -8cd = 7ab + -7ab + -8cd Combine like terms: 7ab + -7ab = 0 -8cd = 0 + -8cd -8cd = -8cd Add '8cd' to each side of the equation. -8cd + 8cd = -8cd + 8cd Combine like terms: -8cd + 8cd = 0 0 = -8cd + 8cd Combine like terms: -8cd + 8cd = 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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