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