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Simplifying -7(6x + -3) + 9 = -42x + 30 Reorder the terms: -7(-3 + 6x) + 9 = -42x + 30 (-3 * -7 + 6x * -7) + 9 = -42x + 30 (21 + -42x) + 9 = -42x + 30 Reorder the terms: 21 + 9 + -42x = -42x + 30 Combine like terms: 21 + 9 = 30 30 + -42x = -42x + 30 Reorder the terms: 30 + -42x = 30 + -42x Add '-30' to each side of the equation. 30 + -30 + -42x = 30 + -30 + -42x Combine like terms: 30 + -30 = 0 0 + -42x = 30 + -30 + -42x -42x = 30 + -30 + -42x Combine like terms: 30 + -30 = 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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