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Simplifying 421 = -5x + 8(8 + 7x) 421 = -5x + (8 * 8 + 7x * 8) 421 = -5x + (64 + 56x) Reorder the terms: 421 = 64 + -5x + 56x Combine like terms: -5x + 56x = 51x 421 = 64 + 51x Solving 421 = 64 + 51x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-51x' to each side of the equation. 421 + -51x = 64 + 51x + -51x Combine like terms: 51x + -51x = 0 421 + -51x = 64 + 0 421 + -51x = 64 Add '-421' to each side of the equation. 421 + -421 + -51x = 64 + -421 Combine like terms: 421 + -421 = 0 0 + -51x = 64 + -421 -51x = 64 + -421 Combine like terms: 64 + -421 = -357 -51x = -357 Divide each side by '-51'. x = 7 Simplifying x = 7
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