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Simplifying 5x + -7(x + 3) = -2x + -21 Reorder the terms: 5x + -7(3 + x) = -2x + -21 5x + (3 * -7 + x * -7) = -2x + -21 5x + (-21 + -7x) = -2x + -21 Reorder the terms: -21 + 5x + -7x = -2x + -21 Combine like terms: 5x + -7x = -2x -21 + -2x = -2x + -21 Reorder the terms: -21 + -2x = -21 + -2x Add '21' to each side of the equation. -21 + 21 + -2x = -21 + 21 + -2x Combine like terms: -21 + 21 = 0 0 + -2x = -21 + 21 + -2x -2x = -21 + 21 + -2x Combine like terms: -21 + 21 = 0 -2x = 0 + -2x -2x = -2x Add '2x' to each side of the equation. -2x + 2x = -2x + 2x Combine like terms: -2x + 2x = 0 0 = -2x + 2x Combine like terms: -2x + 2x = 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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