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Simplifying 7(6x + -9) = 42x + -63 Reorder the terms: 7(-9 + 6x) = 42x + -63 (-9 * 7 + 6x * 7) = 42x + -63 (-63 + 42x) = 42x + -63 Reorder the terms: -63 + 42x = -63 + 42x Add '63' to each side of the equation. -63 + 63 + 42x = -63 + 63 + 42x Combine like terms: -63 + 63 = 0 0 + 42x = -63 + 63 + 42x 42x = -63 + 63 + 42x Combine like terms: -63 + 63 = 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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