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Simplifying -168 = -3x + -4(x + 21) Reorder the terms: -168 = -3x + -4(21 + x) -168 = -3x + (21 * -4 + x * -4) -168 = -3x + (-84 + -4x) Reorder the terms: -168 = -84 + -3x + -4x Combine like terms: -3x + -4x = -7x -168 = -84 + -7x Solving -168 = -84 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. -168 + 7x = -84 + -7x + 7x Combine like terms: -7x + 7x = 0 -168 + 7x = -84 + 0 -168 + 7x = -84 Add '168' to each side of the equation. -168 + 168 + 7x = -84 + 168 Combine like terms: -168 + 168 = 0 0 + 7x = -84 + 168 7x = -84 + 168 Combine like terms: -84 + 168 = 84 7x = 84 Divide each side by '7'. x = 12 Simplifying x = 12
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