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