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Simplifying 7(7x + -9) = 49x + -63 Reorder the terms: 7(-9 + 7x) = 49x + -63 (-9 * 7 + 7x * 7) = 49x + -63 (-63 + 49x) = 49x + -63 Reorder the terms: -63 + 49x = -63 + 49x Add '63' to each side of the equation. -63 + 63 + 49x = -63 + 63 + 49x Combine like terms: -63 + 63 = 0 0 + 49x = -63 + 63 + 49x 49x = -63 + 63 + 49x Combine like terms: -63 + 63 = 0 49x = 0 + 49x 49x = 49x Add '-49x' to each side of the equation. 49x + -49x = 49x + -49x Combine like terms: 49x + -49x = 0 0 = 49x + -49x Combine like terms: 49x + -49x = 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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