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Simplifying 0(-4) + 5(-4)(7) = 0 Multiply 0 * -4 0 + 5(-4)(7) = 0 Anything times zero is zero. 0 + 5(-4)(7) = 0 Multiply 5 * -4 0 + -20 * 7 = 0 Multiply -20 * 7 0 + -140 = 0 Combine like terms: 0 + -140 = -140 -140 = 0 Solving -140 = 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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