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Simplifying 21x + -7 + -15x = 3(2x + -3) + 2 Reorder the terms: -7 + 21x + -15x = 3(2x + -3) + 2 Combine like terms: 21x + -15x = 6x -7 + 6x = 3(2x + -3) + 2 Reorder the terms: -7 + 6x = 3(-3 + 2x) + 2 -7 + 6x = (-3 * 3 + 2x * 3) + 2 -7 + 6x = (-9 + 6x) + 2 Reorder the terms: -7 + 6x = -9 + 2 + 6x Combine like terms: -9 + 2 = -7 -7 + 6x = -7 + 6x Add '7' to each side of the equation. -7 + 7 + 6x = -7 + 7 + 6x Combine like terms: -7 + 7 = 0 0 + 6x = -7 + 7 + 6x 6x = -7 + 7 + 6x Combine like terms: -7 + 7 = 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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