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Simplifying 672 = 12(-7x + -21) Reorder the terms: 672 = 12(-21 + -7x) 672 = (-21 * 12 + -7x * 12) 672 = (-252 + -84x) Solving 672 = -252 + -84x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '84x' to each side of the equation. 672 + 84x = -252 + -84x + 84x Combine like terms: -84x + 84x = 0 672 + 84x = -252 + 0 672 + 84x = -252 Add '-672' to each side of the equation. 672 + -672 + 84x = -252 + -672 Combine like terms: 672 + -672 = 0 0 + 84x = -252 + -672 84x = -252 + -672 Combine like terms: -252 + -672 = -924 84x = -924 Divide each side by '84'. x = -11 Simplifying x = -11
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