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Simplifying 9(-4(5) + -7(-3)) = 0 Multiply -4 * 5 9(-20 + -7(-3)) = 0 Multiply -7 * -3 9(-20 + 21) = 0 Combine like terms: -20 + 21 = 1 9(1) = 0 Multiply 9 * 1 9 = 0 Solving 9 = 0 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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