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Simplifying 420 = -7(-9x + 12) Reorder the terms: 420 = -7(12 + -9x) 420 = (12 * -7 + -9x * -7) 420 = (-84 + 63x) Solving 420 = -84 + 63x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-63x' to each side of the equation. 420 + -63x = -84 + 63x + -63x Combine like terms: 63x + -63x = 0 420 + -63x = -84 + 0 420 + -63x = -84 Add '-420' to each side of the equation. 420 + -420 + -63x = -84 + -420 Combine like terms: 420 + -420 = 0 0 + -63x = -84 + -420 -63x = -84 + -420 Combine like terms: -84 + -420 = -504 -63x = -504 Divide each side by '-63'. x = 8 Simplifying x = 8
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