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Simplifying 7(9 + -1x) = 7(9) + -7x (9 * 7 + -1x * 7) = 7(9) + -7x (63 + -7x) = 7(9) + -7x Multiply 7 * 9 63 + -7x = 63 + -7x Add '-63' to each side of the equation. 63 + -63 + -7x = 63 + -63 + -7x Combine like terms: 63 + -63 = 0 0 + -7x = 63 + -63 + -7x -7x = 63 + -63 + -7x Combine like terms: 63 + -63 = 0 -7x = 0 + -7x -7x = -7x Add '7x' to each side of the equation. -7x + 7x = -7x + 7x Combine like terms: -7x + 7x = 0 0 = -7x + 7x Combine like terms: -7x + 7x = 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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