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