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Simplifying -21 = 7x + -3(2x + 4) Reorder the terms: -21 = 7x + -3(4 + 2x) -21 = 7x + (4 * -3 + 2x * -3) -21 = 7x + (-12 + -6x) Reorder the terms: -21 = -12 + 7x + -6x Combine like terms: 7x + -6x = 1x -21 = -12 + 1x Solving -21 = -12 + 1x 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. -21 + -1x = -12 + 1x + -1x Combine like terms: 1x + -1x = 0 -21 + -1x = -12 + 0 -21 + -1x = -12 Add '21' to each side of the equation. -21 + 21 + -1x = -12 + 21 Combine like terms: -21 + 21 = 0 0 + -1x = -12 + 21 -1x = -12 + 21 Combine like terms: -12 + 21 = 9 -1x = 9 Divide each side by '-1'. x = -9 Simplifying x = -9
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