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Simplifying 9 + 7x + -12 = 3x + 5 + -4(2 + -1x) Reorder the terms: 9 + -12 + 7x = 3x + 5 + -4(2 + -1x) Combine like terms: 9 + -12 = -3 -3 + 7x = 3x + 5 + -4(2 + -1x) -3 + 7x = 3x + 5 + (2 * -4 + -1x * -4) -3 + 7x = 3x + 5 + (-8 + 4x) Reorder the terms: -3 + 7x = 5 + -8 + 3x + 4x Combine like terms: 5 + -8 = -3 -3 + 7x = -3 + 3x + 4x Combine like terms: 3x + 4x = 7x -3 + 7x = -3 + 7x Add '3' to each side of the equation. -3 + 3 + 7x = -3 + 3 + 7x Combine like terms: -3 + 3 = 0 0 + 7x = -3 + 3 + 7x 7x = -3 + 3 + 7x Combine like terms: -3 + 3 = 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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