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Simplifying (4x + 3x) = 7x + -21 Combine like terms: 4x + 3x = 7x (7x) = 7x + -21 (7x) = 7x + -21 Reorder the terms: (7x) = -21 + 7x Add '(-7x)' to each side of the equation. (7x) + (-7x) = -21 + 7x + (-7x) Combine like terms: (7x) + (-7x) = 0 0 = -21 + 7x + (-7x) Combine like terms: 7x + (-7x) = 0 0 = -21 + 0 0 = -21 Solving 0 = -21 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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