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Simplifying -21 + 7x = 7(x + -4) Reorder the terms: -21 + 7x = 7(-4 + x) -21 + 7x = (-4 * 7 + x * 7) -21 + 7x = (-28 + 7x) Add '-7x' to each side of the equation. -21 + 7x + -7x = -28 + 7x + -7x Combine like terms: 7x + -7x = 0 -21 + 0 = -28 + 7x + -7x -21 = -28 + 7x + -7x Combine like terms: 7x + -7x = 0 -21 = -28 + 0 -21 = -28 Solving -21 = -28 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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