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Simplifying -168 = -7x + -6(7x + -21) Reorder the terms: -168 = -7x + -6(-21 + 7x) -168 = -7x + (-21 * -6 + 7x * -6) -168 = -7x + (126 + -42x) Reorder the terms: -168 = 126 + -7x + -42x Combine like terms: -7x + -42x = -49x -168 = 126 + -49x Solving -168 = 126 + -49x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '49x' to each side of the equation. -168 + 49x = 126 + -49x + 49x Combine like terms: -49x + 49x = 0 -168 + 49x = 126 + 0 -168 + 49x = 126 Add '168' to each side of the equation. -168 + 168 + 49x = 126 + 168 Combine like terms: -168 + 168 = 0 0 + 49x = 126 + 168 49x = 126 + 168 Combine like terms: 126 + 168 = 294 49x = 294 Divide each side by '49'. x = 6 Simplifying x = 6
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