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Simplifying 4(-7x) = -28x Remove parenthesis around (-7x) 4 * -7x = -28x Multiply 4 * -7 -28x = -28x Add '28x' to each side of the equation. -28x + 28x = -28x + 28x Combine like terms: -28x + 28x = 0 0 = -28x + 28x Combine like terms: -28x + 28x = 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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