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Simplifying 7(6x + -3) = 42x + -21 Reorder the terms: 7(-3 + 6x) = 42x + -21 (-3 * 7 + 6x * 7) = 42x + -21 (-21 + 42x) = 42x + -21 Reorder the terms: -21 + 42x = -21 + 42x Add '21' to each side of the equation. -21 + 21 + 42x = -21 + 21 + 42x Combine like terms: -21 + 21 = 0 0 + 42x = -21 + 21 + 42x 42x = -21 + 21 + 42x Combine like terms: -21 + 21 = 0 42x = 0 + 42x 42x = 42x Add '-42x' to each side of the equation. 42x + -42x = 42x + -42x Combine like terms: 42x + -42x = 0 0 = 42x + -42x Combine like terms: 42x + -42x = 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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