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Simplifying 21 + -18x = -3(6x + -7) Reorder the terms: 21 + -18x = -3(-7 + 6x) 21 + -18x = (-7 * -3 + 6x * -3) 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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