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Simplifying 4(5) + -20 = 2(2(5) + -10) Multiply 4 * 5 20 + -20 = 2(2(5) + -10) Combine like terms: 20 + -20 = 0 0 = 2(2(5) + -10) Multiply 2 * 5 0 = 2(10 + -10) Combine like terms: 10 + -10 = 0 0 = 2(0) Multiply 2 * 0 0 = 0 Anything times zero is zero. 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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