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Simplifying 21x + -8 + -15x = 3(2x + -4) + 4 Reorder the terms: -8 + 21x + -15x = 3(2x + -4) + 4 Combine like terms: 21x + -15x = 6x -8 + 6x = 3(2x + -4) + 4 Reorder the terms: -8 + 6x = 3(-4 + 2x) + 4 -8 + 6x = (-4 * 3 + 2x * 3) + 4 -8 + 6x = (-12 + 6x) + 4 Reorder the terms: -8 + 6x = -12 + 4 + 6x Combine like terms: -12 + 4 = -8 -8 + 6x = -8 + 6x Add '8' to each side of the equation. -8 + 8 + 6x = -8 + 8 + 6x Combine like terms: -8 + 8 = 0 0 + 6x = -8 + 8 + 6x 6x = -8 + 8 + 6x Combine like terms: -8 + 8 = 0 6x = 0 + 6x 6x = 6x Add '-6x' to each side of the equation. 6x + -6x = 6x + -6x Combine like terms: 6x + -6x = 0 0 = 6x + -6x Combine like terms: 6x + -6x = 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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