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Simplifying 7x + -3(4 + 2x) = 9 + x + -21 7x + (4 * -3 + 2x * -3) = 9 + x + -21 7x + (-12 + -6x) = 9 + x + -21 Reorder the terms: -12 + 7x + -6x = 9 + x + -21 Combine like terms: 7x + -6x = 1x -12 + 1x = 9 + x + -21 Reorder the terms: -12 + 1x = 9 + -21 + x Combine like terms: 9 + -21 = -12 -12 + 1x = -12 + x Add '12' to each side of the equation. -12 + 12 + 1x = -12 + 12 + x Combine like terms: -12 + 12 = 0 0 + 1x = -12 + 12 + x 1x = -12 + 12 + x Combine like terms: -12 + 12 = 0 1x = 0 + x 1x = x Solving 1x = x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 1x + -1x = x + -1x Combine like terms: 1x + -1x = 0 0 = x + -1x Combine like terms: x + -1x = 0 0 = 0 Simplifying 0 = 0 The solution to this equation could not be determined.
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