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Simplifying -6(3x + 7) = -18x + -42 Reorder the terms: -6(7 + 3x) = -18x + -42 (7 * -6 + 3x * -6) = -18x + -42 (-42 + -18x) = -18x + -42 Reorder the terms: -42 + -18x = -42 + -18x Add '42' to each side of the equation. -42 + 42 + -18x = -42 + 42 + -18x Combine like terms: -42 + 42 = 0 0 + -18x = -42 + 42 + -18x -18x = -42 + 42 + -18x Combine like terms: -42 + 42 = 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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