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Simplifying -7(-3) + 2(-9) = 3 Multiply -7 * -3 21 + 2(-9) = 3 Multiply 2 * -9 21 + -18 = 3 Combine like terms: 21 + -18 = 3 3 = 3 Add '-3' to each side of the equation. 3 + -3 = 3 + -3 Combine like terms: 3 + -3 = 0 0 = 3 + -3 Combine like terms: 3 + -3 = 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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