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Simplifying 15(-7) + -8(-7) + 7 = -42 Multiply 15 * -7 -105 + -8(-7) + 7 = -42 Multiply -8 * -7 -105 + 56 + 7 = -42 Combine like terms: -105 + 56 = -49 -49 + 7 = -42 Combine like terms: -49 + 7 = -42 -42 = -42 Add '42' to each side of the equation. -42 + 42 = -42 + 42 Combine like terms: -42 + 42 = 0 0 = -42 + 42 Combine like terms: -42 + 42 = 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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