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Simplifying 4x + -21 = 2x + -1(-2x + -21) Reorder the terms: -21 + 4x = 2x + -1(-2x + -21) Reorder the terms: -21 + 4x = 2x + -1(-21 + -2x) -21 + 4x = 2x + (-21 * -1 + -2x * -1) -21 + 4x = 2x + (21 + 2x) Reorder the terms: -21 + 4x = 21 + 2x + 2x Combine like terms: 2x + 2x = 4x -21 + 4x = 21 + 4x Add '-4x' to each side of the equation. -21 + 4x + -4x = 21 + 4x + -4x Combine like terms: 4x + -4x = 0 -21 + 0 = 21 + 4x + -4x -21 = 21 + 4x + -4x Combine like terms: 4x + -4x = 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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