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Simplifying 2x + -3(x + 7) = -21 + -1x Reorder the terms: 2x + -3(7 + x) = -21 + -1x 2x + (7 * -3 + x * -3) = -21 + -1x 2x + (-21 + -3x) = -21 + -1x Reorder the terms: -21 + 2x + -3x = -21 + -1x Combine like terms: 2x + -3x = -1x -21 + -1x = -21 + -1x Add '21' to each side of the equation. -21 + 21 + -1x = -21 + 21 + -1x Combine like terms: -21 + 21 = 0 0 + -1x = -21 + 21 + -1x -1x = -21 + 21 + -1x Combine like terms: -21 + 21 = 0 -1x = 0 + -1x -1x = -1x Add 'x' to each side of the equation. -1x + x = -1x + x Combine like terms: -1x + x = 0 0 = -1x + x Combine like terms: -1x + x = 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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