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Simplifying 3(6x + -7) = 18x + -21 Reorder the terms: 3(-7 + 6x) = 18x + -21 (-7 * 3 + 6x * 3) = 18x + -21 (-21 + 18x) = 18x + -21 Reorder the terms: -21 + 18x = -21 + 18x Add '21' to each side of the equation. -21 + 21 + 18x = -21 + 21 + 18x Combine like terms: -21 + 21 = 0 0 + 18x = -21 + 21 + 18x 18x = -21 + 21 + 18x Combine like terms: -21 + 21 = 0 18x = 0 + 18x 18x = 18x Add '-18x' to each side of the equation. 18x + -18x = 18x + -18x Combine like terms: 18x + -18x = 0 0 = 18x + -18x Combine like terms: 18x + -18x = 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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