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Simplifying 7(3x + -7) = 21 Reorder the terms: 7(-7 + 3x) = 21 (-7 * 7 + 3x * 7) = 21 (-49 + 21x) = 21 Solving -49 + 21x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '49' to each side of the equation. -49 + 49 + 21x = 21 + 49 Combine like terms: -49 + 49 = 0 0 + 21x = 21 + 49 21x = 21 + 49 Combine like terms: 21 + 49 = 70 21x = 70 Divide each side by '21'. x = 3.333333333 Simplifying x = 3.333333333
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