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Simplifying 3x + -21 + 4x = -7(-1x + 3) Reorder the terms: -21 + 3x + 4x = -7(-1x + 3) Combine like terms: 3x + 4x = 7x -21 + 7x = -7(-1x + 3) Reorder the terms: -21 + 7x = -7(3 + -1x) -21 + 7x = (3 * -7 + -1x * -7) -21 + 7x = (-21 + 7x) Add '21' to each side of the equation. -21 + 21 + 7x = -21 + 21 + 7x Combine like terms: -21 + 21 = 0 0 + 7x = -21 + 21 + 7x 7x = -21 + 21 + 7x Combine like terms: -21 + 21 = 0 7x = 0 + 7x 7x = 7x Add '-7x' to each side of the equation. 7x + -7x = 7x + -7x Combine like terms: 7x + -7x = 0 0 = 7x + -7x Combine like terms: 7x + -7x = 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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