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Simplifying 15x + -21 = 4(2x + -4) + 7x + -5 Reorder the terms: -21 + 15x = 4(2x + -4) + 7x + -5 Reorder the terms: -21 + 15x = 4(-4 + 2x) + 7x + -5 -21 + 15x = (-4 * 4 + 2x * 4) + 7x + -5 -21 + 15x = (-16 + 8x) + 7x + -5 Reorder the terms: -21 + 15x = -16 + -5 + 8x + 7x Combine like terms: -16 + -5 = -21 -21 + 15x = -21 + 8x + 7x Combine like terms: 8x + 7x = 15x -21 + 15x = -21 + 15x Add '21' to each side of the equation. -21 + 21 + 15x = -21 + 21 + 15x Combine like terms: -21 + 21 = 0 0 + 15x = -21 + 21 + 15x 15x = -21 + 21 + 15x Combine like terms: -21 + 21 = 0 15x = 0 + 15x 15x = 15x Add '-15x' to each side of the equation. 15x + -15x = 15x + -15x Combine like terms: 15x + -15x = 0 0 = 15x + -15x Combine like terms: 15x + -15x = 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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